Video Card for Chaintech VNF4/Ultra...

Hi, My Mobo is about 5 years old and I have no idea what video card I should get for it - my VC is wrecked. If there is something on the market that will work with it please recommend something that is appropriate for the following...

Chaintech VNF4/ultra nforce4
Athlon64 3000+(1.8GHz) 512K, 800FSB, winchester, socket 939
Corsair 1GB PC3200 DDR400 Cas 2.5

There is a slot for PCI-express.

I have no idea what video card will max out the above abilities(I don't want the VC to be drastically limited by the above components and thus, a waste of potential).

Thanks for any suggestions. I would like to play games with this system. I will be shopping here most likely,

http://www.a-power.com/home-351

thanks a lot
Eric