Ahh, a fellow Battlefielder. You're in a good position because you already have a decent sound card that you can run Dolby Headphone from, which gives good surround sound for gaming. The other good news is if you're serious about the competitive gaming, it doesn't take much to have the best headphone for it. You'll want to look at the Audio Technica AD700. They're $100 new, but can be found used for $70. For absolute detail whoring and positional audio, it does not get much better than the AD700. They are open so sound is going to leak in and out of them, but there aren't many closed-back cans, and none in your price range, that are going to deliver the sound stage needed for competitive gaming.
Will they be a downgrade for music though? Also when I was thinking about getting the Superlux 668B I got attached to the idea of having a detachable cable (lol I made a punny) for the reason I already said about my dog and to make them easily portable without having to redo my desks cable management.
I don't know, I'm considering it because I found some refurbished for $70 though.
Edited by TheYonderGod - 3/6/13 at 11:25pm