Looks good, but if I were you I would get the 4GB models of the 770, I normally don't like those, but for SLI it would be worth it even if it can't use the extra 2GB as effectively due to the 256 bit memory bus. Either that or CrossFire two R9 280X's, which have 3GB VRAM on a 384-bit memory bus. Otherwise, great build!
I will be playing at 2560x1600 single monitor for now.
Okay, then I would highly recommend either two of the 4GB models of the GTX 770, two R9 280X's, or, if you can, two GTX 780's but that may drive the price up a lot. I would say for that resolution you would want 3GB of VRAM or more, just to be safe.