Ok, going 780 Ti might sound like a no-brainer, but hear me out. I want the best framerate to keep my games sitting at 120Hz vsync-locked as much as possible at 1080, with no dropped frames and the video quality maxed it out or nearly so. Checking out the GTX 780 Ti review shows that the 690 is still a fair bit faster in most games, as you can see in the graph below. See how the 780 Ti is averaging 128fps, not really that much over 120, while the 690 is comfortably above it at 155fps? Ok, while the 780 Ti is sometimes faster and neither card can always go above 120fps in every scenario, the 690 still seems faster on average and will therefore hold that 120fps more often. The price: I can get a B-grade GTX 690 from Overclockers for £500, while the 780 Ti is £560 (which will drop a bit soon, hopefully). The 690 is discontinued, so I don't have a lot of time to decide, should I get it. Note that I've bought several B-grade graphics cards from Overclockers and never had a problem with them, so feel confident that I won't have a problem now. I'm not bothered by the 2GB usable RAM on the 690 which would be a hindrance for 4K capability. I will continue using 1080 for the foreseable future, since by the time 4K is established and affordable, any graphics card sold today will be obsolete or nearly so. I'd likely upgrade my 2700K CPU, mobo and memory at that time as well. I'm not bothered by the use of SLI on the 690 since it's always worked very well for me, with excellent performance and very few microstutter problems and am using it now. Note that if I get either card, I'll sell my two MSI 3GB GTX 580 Twin Frozr II cards so the overall upgrade cost won't be so huge. Finally, I'm not interested in going AMD, even though the HD 7990 is the fastest card overall and quite cheap now at £440.