Well, yes, at 1920x1080 you can forget the 560. And maybe the 570 too.
IMHO, a 6950 would be a better choice - If you are just gaming.
-Less power consumption
-Can be flashed to a 6970 should you desire
-Better crossfire performance
But if you Nsist on Nvidia, go with the 570, you cannot lose with that either.
I have no real preference i just heard the nvidia cards are overclocking monsters, im trying to get the most out of my machine as i can without upgrading down the line