If under $150 after rebate is ok you should be looking at a GTX 460 or HD6850. The would be highly preferable to the HD6790 Maziar mentioned for 1080p.
Giving your CPU a nice OC for now and upgrading it when you can would be a very good idea BTW. Your motherboard supports all AM3 processors.
First off thanks to both of you for the replies. Is there any preference one way or the other for what I am wanting a card to do between those two? When I searched for each it seemed like there were several variations of each card, or am I wrong?