How much ram do you want to run?
Many of the best overclockers only do so with a single stick of memory. Pretty much any of the i845g boards are good. The 4G4A is popular for the price, but I had issues with the RAID board. The ASUS P4B533 and P4B533-V have made good showings. People have complained about the P4B533-VM (microATX) version not doing as well.