I have the same MB with a p3-700. I'm using the alpha 3125 HS from 3dfxcool, he calles it the Alpha1HO-P3-FAN. Its straght up bada$$. It got my p3-700@1ghz and it runs at 35c all day under load. Just an idea.
P.S. This forum is way better than before, I'm going to really check it out often, I'll be around