Save your money and just get a second GTX 560 Ti. Especially when given a nice OC two of those in SLI should have no problem with any game at max settings at 1080p. The difference between that and the options you listed will be negligible.
It's a 560, not a Ti, and I am building a new system, so should I recycle it? I really want 570s or something in that class SLid/CFXd
EDIT: and what about 3X 6950s?