I have a Shimian and I run games with a single 560ti. It's not ideal, of course. But, you will be surprised how much your 470 will handle. I've played ME3 and Arkham City, and, they both look great. AC needs some of the settings reduced, but you don't need to (or want to) play in 1080. You won't need to have much AA going at this res, if any at all, for things to look less jagged. So, that's something to keep in mind. These screens look great. The difference in user experience more than makes up for the reduction in graphics bling compared to 1080p, especially compared to a cheapo TN panel. Maxed games on a 1080p TN panel look shabby in comparison to 1440p with reduced settings.
I think the best advice in this thread is to play the games and see how it goes. Then you can decide if the 470 performance is acceptable to you, or not.