gtx 970 or amd r9 390x
performance to watt noice heat dollar is better on the gtx 970
but the r9 390x does perform better in a bunch of benchmarks now
but because the 970 is around 320, i would recommend that vs the 400$ 390x,
personally i dont think the small performance diff justifies the cost.. but technically the 390x is the best of the to, and you can get it for your budget