I have the game one and I think my audio technica ath ad700 sounds way better. There's a much wider Soundstage and it is far more comfortable to wear. Wish I just went with a decent stand up mic of some kind. Used to have the Zalman clip-on mic and hated that as it would pick up everything...
750ti seems like the best option from Nvidia camp. I have a gtx 660 and it was bottlenecks by my 3.2ghz q6600. I just built a small computer with a g3258 and reusing my 660 improved my framerates in WoW and LoL by a pretty good margin. 660 is supposed to be a little more powerful than a 750ti.