Well if you blew you're budget by 9 dollars,95, you can get a ATI Radeon 9700 PRO 128mb, which will play up to date games rather efficently, especially with that CPU you have :P
Find it at:
It is a really good card, and will run up to date games, and has only been opened for testing!
Or if u'd rather go for Nvidia, you can get a good Geforce FX5900 from the link below:
I'm sure they'll be more. try looking at www.microdirect.com
there rather cheap
These cards will definetly work as that motherboard must have an AGP slot, to accompany that kind of processor (must b rather up to date)
Hope i've helped