Do you want to overclock? If yes you should get k-series processors, if not, then the non-k ones are fine. The i7s would be much better than the FX-8350s. Now ultimately, for gaming the i7s vs the i5s for gaming don't really make too much of a difference. I think a lot of the tests show its only like a few fps gain going from an i5 to an i7. The 2 models you should consider is the i5-4690(K) or the i7-4790(K).