Sapphire HD 4650 OC Edition 512 MB
 

Sapphire's HD 4650 Overclocked comes with a solid overclock out of the box. But during our own overclocking tests we saw an amazing untapped overclocking potential resulting in more than 20% real world performance increase. Even without overclocking this card, that's in the $70 price range, is an excellent deal considering price/performance.

http://www.techpowerup.com/reviews/Sapphire/HD_4650_OC