Death Demon-1368664 :
I would suggest Evga or msi gtx 760. Evga for its customer service and msi for its technology(Dust removal technology, More cooler and quieter than other cards,twin frozr iv thermal design, millitary class iii components, etc). As far as hd 7950 concern's i saw ur future build that u'll going to use a 500watt psu then u should remove 7950 from ur list. Gtx 760 will always outperform a 7950 at its stock speed. Since a 500watt power supply is not good enough to oc 7950 then i suggest go for gtx 760 for sure. I'll recommend Msi gtx 760 Twin frozr. As it can be easliy oc'ed to 1163 mhz which is pretty high enough for ur gaming needs. Thanks to nvidia's new technology GPU BOOST 2.0. And if u r worry about 3GB and 2GB comparisons then let me help u with this. If u r gaming @ more than 1920 x 1080 then a 3GB 7950 version u shud get otherwise i'll prefer 2GB 760 for sure..
My recommendation-http://www.amazon.com/MSI-N770-TF-2GD5-OC/dp/B00CZ58WUI/ref=sr_1_1?s=electronics&ie=UTF8&qid=1380483125&sr=1-1&keywords=msi+gtx+770
Nice pointing out to the psu, but the point is, if that he got the hd 7950 for say 30$ or 40 less
http://www.amazon.com/Sapphire-DisplayPort-PCI-Express-Graphics-21196-00-20G/dp/B00BXVFM3K/ref=sr_1_2?ie=UTF8&qid=1380188636&sr=8-2&keywords=HD+7950 (if he is buying from amazon, it will happen, if buying from local shops, maybe they have their pricing scheme), he can invest this 30 bucks in a lot better psu that will be enough for overclocking the hd 7950 easily, or he can even buy this 600W for same price as the 500W and oc with it http://www.newegg.com/Product/Product.aspx? Item=N82E16817139028&Tpk=CX600 . I think the power supply isnt the problem, but the op should decide if he needs to overclock or not, if he needs phsyx or not.