Over the past year, I have become increasingly frustrated with AMD due to their driver support. I'm running two 6950's, and am at the point where i just want to get rid of them and change over to Nvidia. My question is, is it worth making the switch to nvidia right now or would it make more sense to wait for the next gen of their cards to come out? My motherboard does not support SLI, so i am just looking for a solid single gpu card. Would something like a 670 be an upgrade or not?