2 560's will beat a single 560 Ti pretty easily.. 2 550 Ti's would be close to a single 560 Ti. (probably a little better but not by much)
The question you have of 560 vs 550 Ti is simply one of cost to performance.
If a single 560 Ti is enough for you then the 2 550 Ti's will be enough. If a single 560 Ti is a bit under where you want to be then the 560's are the right choice.
With all this said, and if a single 560 Ti's performance was what you were aiming at, why not just buy a 560 Ti?
You must have gotten some bargain if 2 550 Ti's were cheaper or the 560's were better performance per dollar.
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