Recently I have been looking at some GPUs, because I want to upgrade from my gtx 660, which I had for 1.5 years. I am torn between getting a Sapphire Radeon R9 290 4GB for $440, a EVGA GeForce GTX780 SuperClocked w/EVGA ACX Cooler 3GB GDDR5, or to wait for the R9 390, which might come out this...