570 is out of my reach. It still arround 21-22k. But this 560ti(448) is quite impressive, little oc to mach 570.
7950 is very good gpu,but i like physx as well. (there r very few tytles though). Presently i am using 5770 as a main card and a 240gt for physx. But now i want a single card solution, so i thought about that gpu.
PhysX is utter gimmick ( IMO ) but if you do need or like it you have GT240 ( what you will do with it then ) - if you enable physx on a single gpu solution it just reduce in-game FPS - so a discrete card for physx is more good - HD7950 is a very powerful card and can be OCed really well to get more performance.
Anyway, tkin has given you nice suggestion - so you can also wait for the release of kepler gpu - if it can perform well it could be the gpu you want or else it will create a good competition ( read reduction in gpu price ) for sure