Some things you mentioned, Tilpo, is why I'm still with just the Clip+ (35 euro), Fiio E6 (30 euro) and B2's (the most expensive thing I've got).
Little explanation in between.. I'm a bit different to most of the folks here I noticed, I don't really appreciate gear enough that makes stuff sound nice and warmer (tubes, some DAC's), it's as if I'm using an EQ to make stuff sound nicer, I don't want stuff to sound nicer. If the production of a piece of audio quality was crap, I'd like to hear it as crap. I'm more of an NwAvGuy-believer (the hated and banned person on head-fi for using measurements instead of feelings, responsible for gear like the O2/DAC), when it comes to stuff.
Now, when it comes to my gear.. the source.. cheap-ass Clip+ but an almost perfect flat output, considered by some here as "not audiophile enough" ..whatever; cheap-ass Fiio E6 as it was measured to put out what it gets in as it is good enough.. and the headphones? They're not perfect, exactly how I'd actually prefer it as IMHO there can't be a single headphone working perfect for everything, and that's fine. So, am I done? Nope, but whatever I'll add won't be anything costing >200.. as Coop for example showed me, he bought some 45 euro (or something) IEM's that sounded literally superb (as in: it has awesome qualities for certain moods/music and is a perfect all-rounder). Stuff doesn't need to cost a lot to be good, I simply don't buy that ;).
Looking at the gear you've got however, you've got the warm sounding stuff (IE80), the superb highs (Stax), the perfect matching (HD650), the fast and the slow processing, new and the old stuff.. soooo much choice compared to what I've got, so many ways to enjoy whatever audio you'd want to listen to and what mood you're in.. You've still got diamonds right there, and the main thing in my honest opinion again, is to enjoy them for what qualities they have and for what they are and start loving them, with that gear I'd personally wouldn't see the need to add more.
Does that make you less of a hi-fi person? Nope, because as you said.. even the low-fi stuff will eventually sound nice for what it is.. everything and even the reaaaally cheap stuff has its qualities the things to love about it. Then, are you done with hi-fi? Nope, because you're just done buying, you've already got extremely enjoyable stuff.
Now go enjoy, and I'd love for you to come to a next meeting as well, just to listen to other funky stuff for whatever good and bad sides it has, I'm doing the same :).
Edited by laen - 1/17/13 at 4:00pm