I fully endorse the AD1000x as well, if you prefer not to upgrade from Fulla 2.
It takes no effort to power, and amazing with string instruments and female vocals (especially japanese female vocals). The bass is lean but the highs and mids is what Audio Techinica's Air series is about.
There's more clarity than the legendary HD6-- brothers, and quite frankly I prefer the AD1000x. The build also blow them and the 7xx out of the water.
As for gaming, the AD1000x is pretty good. Because its bright headphone, gunshots and bullets sounds sharp and more realistic. Imaging is pretty good also, but I do not know how that is compare to the 7xx
There is one glaring issue though, the pads are so thin it makes the headphone uncomfortable and ill fitting. So you will need to pad roll, and stick with velour pads.
If you can find them for $250 they are totally worth it, although $300 is not bad also.