Athlon 64 3000+ CPU/Motherboard Combo
 

The combination of the Biostar K8M800 motherboard with the AMD Athlon 64 3000+ processor should provide a substantial performance boost over an existing 32-bit system and save you plenty of money with onboard 6 channel audio, 10/100 LAN, and all be it very under powered video with the option of carrying over an AGP video card.