You can probably find a Nvidia GeForce 8600 for $50-$75 if you look for a deal...that'll set you up for anything you want to do on a PC...it'll play the latest games with good settings.
Otherwise an 8400 would probably be fine for you as well...it will also play most newer games on good settings I think...it should be more than good enough for your purposes anyway.
Here's one that's $37, $27 after the mail-in-rebate: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127296


LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )







