Your board supports the following list of CPU's consisting of Pentium 4 and Celeron's
Biostar USA
Both those CPU's should work.
The Radeon 9600 xt was a good AGP 4x/8 card but think it still will run you more than $25 but you should check the auction sites. I have a 9800M (M-mobility or laptop video) with 256Mb RAM running Windows 7 Pro 32, 2 Gb RAM in the laptop and a 3.4 GHz CPU and it runs very well, the 9800M is less of a card than the 9600 xt.