Yes is a great build. Buy 560Ti is better than 560. 560 is an 460 overclocked and rebranded.If you don't SLI buy an 650W PSU is more than enough.
Well, is 750w suffice if I do choose to go SLI in the future?
Also is the 560 Ti worth the $40-$50 more?
If I went with the 560 Ti, do you think I could just drop down to a haf 922 and still have enough room? This would allow me to stay within my budget (which is very strict).
Also, would there be a better SLI configuration for around the same price?