If you're after gaming/accuracy/soundstage, the AKG702's are untouched by anything anyone else has listed here.
As an owner of AKG K702's AKG K7xx's and some Beyer DT770 Pro's the AKG's are totally unrivalled for their positional audio in games.
Super sharp, they can be a little bright for some music listeners, and some say they are a little fatiguing, as they're not quite as 'fun' and bassy as Beyer's But IMO you get used to it very quickly. If you're playing FPS games, honestly, nothing touches them for Binarural.
I spent a lot of time researching them and got them before they moved their manufacturing, but the current ones are still fine and come with a more comfortable headband.
Personally, I matched them up with a Xonar STX because the headphone amp has a bit more juice and is setup for binaural more than the creative offerings at the time, that and I loath creative cards after the X-Fi because they're crap software-based solutions with price tags that are just ridiculous, but as you've already got the card, no sense harping on about that now
If only M$ would bring back the proper DirectSound pathways so EAX could be run on hardware again.. *sigh*.. Wishful thinking.