Easy with that cpu you can use ; (from less to more power within your range budget) an ati radeon hd 5770, hd 6850, hd6870. Nvida gtx 550ti, gtx 460 1gb, gtx560 ti (this one is 40 bucks out of your range). hope this helps you.
Newegg has a Sapphire Radeon HD 5830 for $109. Unless your monitor resolution is better than 1080p I don't think you need more. Card is 1 gb DDR5 256 bit.
Question is what resolution do you have, need and want.