HD 800 is a total waste if you buy it for gaming alone, especially pairing a Mixamp with it.
I had the K701, many Beyers including the T1 and I can't recommend anything above T90. The T90 only if you can get a great deal, otherwise DT990 600 or something with lighter bass "should" be endgame.
Consoles are limited in memory and space, thus audio gets a cut. Even though some PS3 games offer much less compressed audio (most exclusives and a few multis like Hitman, Blur etc...) most games share the same audio files across all three platforms, being limited by the Xbox 360, and you really don't wanna know how limited some of them are. Skyrim for instance is totally embarassing in that regard. And then you need gear to extract that PCM audio (or the corresponding DTS encode) properly. Mixamp won't cut it. It's limited to AC3 and SQ isn't pretty.
Of course the situation is a bit better than years ago but is going backwards from a technical standpoint. While the Fear series (1+addons), Thief, Bioshock 1 utilize superior tech and better rendering than games today, the recordings are of lower quality.
If you want the best and cleanest audio, you play on PC and a HD 800 makes much more sense but the above "rules" still apply.
With the new console generation upcoming it can only get better recording-wise. Rendering probably won't except on Sony exclusives or 343i games/Epic Games and a few better equipped or "gifted" studios.
Now don't misunderstand me. For me the HD 800 beats all others, it's SQ, imaging and soundstage is noticably superior to all of them, they are the finest for gaming that I know of but in the end you have to consider the limitations set by games.
P.S.: At the moment I consider the Fidelio X1 the best bargain for gaming and music. If you live in the EU and can get your hand on them, do it while they are cheap.
http://www.amazon.it/Philips-X1-00-Fidelio-Auricolari/dp/B008ZW2T7M/ref=sr_1_1?ie=UTF8&qid=1353740252&sr=8-1