Whats the best used card I can get for ~$50?

[hardware_failure]

Ive got a spare c2d system w/ onboard video and Im going to give it to family. The kids would like to do some light gaming.

Thanks.

Edit: some more info. its a dell system with stock 400w psu, so something like a 460 gtx would prolly be too power hungry.

 

[Araxie]

check this that will give more or less a guide..

 

[bastage]

Dell psu's are fairly robust for their ratings. You would probably be ok with a 460. Ran a 4870x2 in my wife's Dell with a 535w and it was a hell of a power hog.