GTX 285's SLI VS GTX 560 TI's SLI

[kpat99]

I'm upgrading from a surround setup of 3840 X 1024 to 4800 X 1200 and i'm thinking my 285's are gonna be too slow. I Just don't want to move up to 2 570's, (too much cash) and i'm wondering if 2 560 ti's would run things without much problem. Modern Warfare 3, BF3...

Any thoughts would be appreciated

Thanks

Kevin