4k 60hz gaming, or the Rift. I'm not sure how intense Remember Me is, but a friend told me he noticed occasional tearing on that game with his new rig that was using an older R9 2xx-X until he got his GTX 1080s in the mail.
Ah, I have no screen for 4k and am holding off for the time being. I just don't see the cost/benefit paying off for a bit, as I'm still very happy with my first-gen 42" plasma I use in my bedroom @ 720p, though I must admit, vs. the 1080p 50" in my living room, I can't tell much difference anymore, so I'm definitely getting blinder...
I have a 42 inch 4k@60hz Seiki I got for a couple hundred bucks last year, I'm happy with it as my sole monitor (replacing two others). It's not as good as others for gaming but good enough. At that size the pixel density is roughly the same as my smaller 1080 and 1200 monitors it replaced so it really does end up feeling like 4 screens, while having more vertical pixels than my 1900x1200 that I had on its side. I could probably live with a 720 plasma as a TV but not as a monitor I do work on...
It still makes a surprisingly decent bedroom television; for computer use, I agree -- resolution is just too low for comfort.