Wth the ATI games you can't use PHYSX without an nvidia card like the 560 ti. I think physx is mostly a gimmick. But just something to consider.
Games such as batman, adds but neat looking things. But you probably wouldn't be able to notice it unless you were told.
I have an evga 560 ti.
I would get a different PSU below over the one you got. There's this one It's cheaper for now with free shipping and better. Basiq is Antec's economy PSU line, which isn't 80-plus certified, and has shorter unsleeved cables.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371035