eVGA 131-K8-NF44 S939 Motherboard
 

This board is Socket 939, which has recently been replaced by Socket AM2. It might seem a little pointless to be considering this, but if you have a Socket 939 chip already on an AGP motherboard, then a PCI Express motherboard would be a good upgrade to increase gaming performance, and wouldn't involve throwing the rest of your system away. After all, that low latency 400MHz DDR memory wasn't cheap, was it?