If you can find a GTX 650 Ti under 10K, get it eyes closed, but dont bother with the non Ti version.. If you cant find, get Gigabyte/MSI HD 7770 from smc for 7.9K
But remember, you need a good PSU first, the cheapest solution is CX430v2
However, take a look atGigabyte PoweRock Power Supply, 80Plus Certified, True 550W 550 Watt SMPS i5 i7 | eBay
Even though no one uses it, It has got some good reviews in websites.. Also it is more futureproof than CX430v2 having the same price and being a gigabyte product.. you neednt worry about warranty as long as you have a service center in your area