GTX 660 ( non ti ) or HD 7850

And yes your PSU is more than enough.....the vp550p combined power is 540 watts on the 12v rails....

the 660 is faster overall, but you can normally get the 7870 for the same price as 660, which is faster overall than both of those cards.

^ i thought of the 7870 actually but i couldnt find any cheaper one, so in my area the only available cards for my budget are the 660 and the 7850, i play borderlands 2 and arkham city, i saw the huge difference between physX with and without, so kinda confused, even if i can grab a 7870 i still lose the physX feature, dunnoo -_-

660 is faster both are great cards i would pick the 660 has extra features, like
http://www.legitreviews.com/article/1881/2/

Well, 2 votes for the 660 from merandos and bigcyco, plus the physX feature and not that much difference from the 7870 overall performance, i think am going for the evga ftw that merandos suggested its oc'ed alil bit higher and same price as the gigabyte one....
thnks guys  

Best answer selected by eldergtx.

urw....

Your welcome enjoy!