I've started looking at parts for a home built system. There are so many choices though that it's hard to decide. So far I'm thinking an i5 4670k with an nvidia 670, 8gb ram and a 7200 rpm hard drive. One thing that I can't figure out though is why there is nearly a 100 Dollar difference between the EVGA 670 and the ASUS 670, I'm kind of leaning towards the gigabyte gtx 670 just because it's in the midrange.