I guess the question should be with a good videocard (probably overclocked) would the I5 be sufficient. I have heard only good things about the 3570, but is there that much of a difference between that and an overclocked 2600k or is the I5 good enough alone?
I am actually building a machine with the 3570, but have considered getting an I7 also. But in gaming right now most games do not utilized hyperthreading one bit.