If you want them specifically for Black Ops I'd just go with a $60 pair of x11's. They're olny stereo but Black Ops sound system doesn't really work a whole lot better with 7.1 Dolby sound, the directional ques aren't really up to par but Treyarch has said they're gonna be fixing those issues for Black Ops 2 and the 7.1 dolby works well in all the other CoD games, and is great for just making explosions and stuff sound bad ass. For $60 bucks the x11's work supprisingly well though, especially for Black Ops.