Hi all,
First off, just a quick headsup that I'm new to Head-Fi (first post!) and absolutely brand-spanking-new to the Audiophile world in general so apologies for any stupid questions etc while I figure out all the ins and outs of everything

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Summary - in short, I'm trying to figure out:
* If the Magni/Modi is "right" for me - whether it'd suit my headphones, setup, etc
* Whether I could/should pair the Magni amp with a higher-end DAC (such as Bifrost) instead - whether that would yield little return over the Modi, etc
* If there are other, better options for me out there.
All my main questions are at the bottom of the post, so scroll there for a quick list if you wish
So - a little more detail.
I'm actually in a weird place with music. I'm sure most of you have huge music collections, probably in FLAC or similar, likely loads of CDs and/or vinyl, and/or a large iTunes library etc. I'm sure most people have, tbh - but as I say, I'm in a slightly weird place right now. I didn't really get into music at all until I was in my early teens, and having had no real musical influence growing up, most of that was the typical top 40s stuff of the day - Britney Spears and Busted and all that kind of cheesy pop stuff!
As I got older I moved on / away from that music.. But due to my living situation and an ongoing lack of people around me listening to / recommending music, coupled with my focus in other areas, I never really picked up new ("new" new, or old new, if that makes any sense) bands, singers, genres, whatever. I dabbled a little in Dance/Trance/Electronic, and a bit of Pop/Rock stuff, but never really built a concrete music collection outside of a few tracks. Back in "the day" I had Tapes and CDs of the bands that I listened to but over time they dwindled, got lost, damaged or sold and eventually I ripped the last few (to not-especially-high-bitrate MP3 no less!) into digital format in an effort to go totally digital.
So that's where I'm actually currently at - just under 4 gigs of not-amazing MP3 and no real idea of where to go from here in terms of discovering new music that I may like. Sorry for the long ramble about all this, and it's really not relevant to this post at all, except to answer the question of my sources, or what music I currently listen to - at the moment, not much at all, really. I've actually started coming "back" to music in probably the wrong way - buying gear and trying to figure out the music itself after that!
However that's not the only thing making sounds - aside from the obvious Windows sounds I'm a bit of a gamer, so tend to use my various output options for gaming a fair bit (sometimes both at the same time, if the game soundtrack leaves something to be desired!). I'm not a competitive or hardcore gamer by any means so I don't really need or worry about things like super-accurate footstep locations etc. My game collection is pretty broad including FPS, RTS, MMORPG, RPG / Action RPG, and all the less-easy-to-categorise. Let me throw a few names out there, off the top of my head - Half Life (and derivatives - CS, TF, etc), Unreal Tournament, Mass Effect, Starcraft, WoW, Minecraft, Gone Home, FTL, etc etc etc (the list goes on but I don't have Steam open right now and don't want to bore anyone to tears!)
All my music playing happens through my computer - I don't have a CD player, turntable, radio, whatever. Just my PC - it's a laptop, so no fancy sound card, and as it happens the onboard sound chip crapped out on me so I grabbed an emergency £1 USB Chinese eBay sound card for my laptop, so I could at least hear
something. And you know, for a super, super cheap little dongle that is literally falling apart and I had crammed in my IT bag for years, it's not
terrible for the music that I currently have, although of course not ideal.
So, gear - back in the day, I used to just buy Sony or Panasonic circumaural headphones from Argos or similar, the £20-£30 typical cheap stuff, which always did the job for me on my low-fi players (Walkmen and such). More recently, I've always been a fan of Sennheiser, not really sure why and honestly it's probably something someone told me once or an impression I got from somewhere but it's led to me focussing on Senn stuff whenever I've bought headphones in the recent past.
Currently, I have a set of Sennheiser RS 180 (I love wireless as it lets me move around my desk/house without getting tangled, although I appreciate there is generally a respective price jump and quality drop because of this. Also, I had a set of Senn wireless headphones before (I forget the exact model), and the wireless range on those were truly supurb, whereas these drop out over much shorter distances (I assume due to something like the old ones using a mostly unused wireless frequency, whereas these ones are on the 2.4Ghz band, possibly? I hear that the range on the RS220 are even worse)) which I use more than my speakers, so up until recently they would have been my main transducers.
Once the sound card in my laptop crapped out and I had to get the new "sound card" (I use that term loosely!) I decided to also pick up a set of half-decent (for PC) speakers as well - Creative GigaWorks T40 - and those are now my main speakers. Currently my time spent on headphones/speakers is about 50/50.
For travel (iPod classic) I also picked up a set of Sennheiser ie8 earphones a few years back - that was my first serious purchase in the audio world and I have to say, they really are lovely - BUT - I find that ear canal 'phones cause my ears to get quite painful after an hour or so, and end up feeling bruised for quite a while after I use them, so they mostly get confined to their case unless I really
have to be portable and have music.
Sennheiser HD 598 - I've had my eye on these for quite a while, constantly debating whether to start "small" or just say screw it and save up for the HD800, but sense and a realisation that my source, Amp, DAC, and everything else would screw me over for anything that high end made me see sense and I finally decided to take the plunge on the 598s a couple of weeks ago. They look beautiful, feel great on the head, but have mostly been sitting unused since I don't really have anything decent to drive them at the moment.
Sennheiser HD 380 - My job involves a small amount of video editing on another PC, nothing drastic but I had nothing to fit the bill at the time I bought these (about 6 months ago) for playing sound at all, so I plumped for these. Great sound isolation (which is mainly what I needed) but they clamp my head like they're trying to eat it, so I don't use them except for "work".
In terms of players, I have an iPod classic (mainly for work, but I do get to use it for personal stuff on occasion), and iPod nano (purely for fun and "out and about"), and of course my PC - I usually use Media Player Classic, with VLC for the occasional FLACs. I have a little experience of Winamp from years back but always happy to take new player recommendations

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So yeah, that's me at the moment. Obviously, I need some kind of Amp/DAC. When I first started doing research, FiiO popped up and were my #1 choice for a while, but after coming across a few threads over here a while back I saw people recommending Schiit, and I've been kinda hooked on the idea ever since.
I'm pretty certain that the amp, if Schiit, would have to be the Magni for one simple reason - it already gets REALLY FREAKING HOT in my room, and adding another 40-45° radiator to the mix (according to their FAQ) just isn't going to fly. Anything I buy needs to run cool, or my laptop is in danger of melting and my hair catching on fire, haha!
I can't find any indication on whether their DACs run hot as well (I'm a total newbie to Amps and DACs so forgive me if this is a stupid question), so if this is the case it looks like it'll have to be the Magni+Modi.
That said, I can't actually see anything saying the typical running temperature of either the Magni or Modi - can any owners out there chime in about this? Also, can any Bifrost owners chime in on the running temps of that device?
Aside from temperature, what I really need to figure out is:
* Will the Magni/Modi power the HD598s ok? What about my speakers?
* If not, would upgrading to the Bifrost help?
* Is it useful to pair the Bifrost with the Magni, or would there be no increase in power/performance/whatever without the equivalent jump in Amp upgrade?
* How would the Magni/Modi likely suit my needs (music/gaming)
* How would the Modi likely compare with the Bifrost for my needs (music/gaming)
* Are my headphones a terrible choice for my current sources (music) / needs (music/gaming)
* If so, which headphones would you recommend for my situation?
* If the Schiit stuff would not suit me, what Amp / DAC would you recommend for someone in my situation? I quite liked the idea of the FiiO stuff a while back also...
Bear in mind that my current audio sources are MP3s and games, although as I get into music I'm hoping to mostly build up a collection of FLACs/other lossless.
Also - budget. I don't have a fixed budget per se, but I'm certainly not made of money, and whilst I can dream of HD800s and a Ragnarok/Yggdrasil that sure ain't gonna happen any time soon. From my local UK distributor of Schiit (Electromod), the Magni/Modi and PYST cables (RCA & USB) all together comes to about £205 IIRC, which is a very nice price. I can certainly stretch to the Bifrost, but I don't want to waste money if I wouldn't see an improvement - after all, I'm no audiophile - yet!!
Apologies for the (probably unnecessarily) long post, thank you muchly for reading and I would appreciate any advice that I can get

. Any questions welcome, and apologies for my noob-ness.
Thanks again!