with the new revision of the southbridge just coming out it might be a good idea to wait a couple weeks before buying (current amd mpx boards dont have working usb, they come bundled with a pci usb card.... but that uses up one of your few 32bit/33mhz pci slots)
but to answer your question the tyan tiger mpx is a good board (the model with the new southbridge is S2466N-4M... S2466N is the old one)
also im looking forward to the epox m762a, and the iwill mpx2