I can vouch for the 970s as stated above. I ran with one for a long while until I converted to 4K and it just couldn't handle that resolution above 30 FPS and I had to switch to a 1080. Most of the 1000 series will give you solid performance in the 1920 x 1200 to 2K range so that's a safe bet and will do a bit of future proofing, but if you have any prospects of 4K gaming (and let me tell you that it's gorgeous) then you want to stick to the higher end of at least a 1070 if not a 1080.