You can buy the HFI-780's for $189.00 USD at RMC Audio (no ship/tax to Texas):
Ultrasone HFI-780 S-Logic headphones
Just do the "click for best price" link and enter your email and they'll send you an email with the lowered price.
I have both the A900 and HFI-780's. Both are very easy to drive (don't need an amp). I originally bought the A900's for gaming (prefered closed over the open AD series because of college conditions and because they have more bass) and music bout 4 years ago based on Head-Fi recommendation, have served me well. They're good for pretty much any genre of music and excellent for gaming (detailed, good soundstage, excellent positioning, decent isolation, and engaging bass for immersion). As far as FPS goes, I used them mainly for CS1.6 and CS:S (other genre's didn't matter much but they were fun and immersive for single player games too). My only complaint about them were the pleather pads. They're super comfortable but they started to flake after 4 years of service (i used them a lot... 6-8 hrs a day for 4 years) during the school year). Didn't like the fact they give me a mohawk after prolonged use either, but meh, all headphones mess up your hair.
Little over a month ago, I was itching for a slight upgrade that had a bit more bass (impact/quantity) and bit more forward and Grado-esque sounding (really liked my KSC-75's for rock when I had em before the A900's). I ended up getting the HFI-780's and I absolutely LOVE them. I think they do pretty much everything the A900's do but better. They're more aggressive, forward, bright (not as bright/harsh as the KSC-75's though), overall more detailed, mids are less recessed, and better bass (more tight, detailed, and faster, as well as quantity) - about everything I wanted. I haven't really played online FPS's much recently though, other than L4D, so I haven't really compared them to the A900's for gaming, but they do just fine so far. And according to that link momomo6789 gave, apparently they're very good for gaming. Gaming wasn't really a primary concern when I chose them, though I knew they would do great for movies. My only warning though (for music), if you're very sensitive to higher frequencies (brightness), you might want to look at the Sennheiser or the Audiotechnica series. I don't even really notice, but to a few do. Though the KSC-75's brightness (not to mention simbilance) did kinda hurt my ears when I first got them, until my ears adapted and they burned in. Also, they can be uncomfortable to some, but I don't experience any discomfort at all (and I wear glasses). You can replace the pads with Beyerdynamic DT250 pads if you don't like the pad material. Just make sure you burn them in (recommended 200~400 hrs), because I did noticed they changed quit a bit for the better after a month of nonstop burn-in, which is really surprising considering I was always kind of skeptical towards the burn-in effect (didn't really notice it on my A900's).
So my point is, I highly recommend the HFI-780's. I can recommend the A900's too, though I think the HFI-780's are a step up for music. As far as less bass for gaming headphones, I personally disagree. Though I do understand that some people believe that bass can "cover" up the details from the mids and highs, headphones with more bass offers much more immersion and fun. So unless you're very anal about that and compete, I think bassier phones are better overall (especially if you like it in music).
EDIT: guess I'm a bit late...
