The PSU is definitely larger than you need for a 560ti OCd.
You could get by just fine with an XFX Pro 650w Core instead, or an XFX XXX 650w if you really want to have modular.
I would get this brand instead of Corsair which has some spotty PSUs in its line up. None of the XFX PSUs are anything but the highest quality.
I would also get a 7970 instead of the OCd 560TI. You should have no problems fitting that in a budget of max 2000 and it performs a lot better than a 560TI does. So much that they aren't really comparable.
Otherwise, everything should be fine.
For $200 I wouldn't take anything less than a Lian Li case if it was me, though. They are like the Porsche of cases and Corsair is more like Ford. The Ford GT can beat a lot of Porsches in a race, but its still a Ford.