I have the Gigabyte 8SRX, so I will vouch for this board. My P4 1.6A is OC'ed to 2.22GHz, although I can run it at 2.32GHz, but Prime95 will give rounding errors. At 2.22GHz, my system is absolutely stable, no crashes whatsoever. People have had lots of success with ASUS P4S333 as well. SiS645 boards have done extremely well, and with DDR333, performance even surpasses Intel 850 with RAMBUS when memory is overclocked. My memory scores are 2524MBs/2557MBs, which are higher than Intel 850 PC800 CL2 RDRAM scores on Sandra. Anyways:
SiS645
1. Gigabyte 8SRX
2. ASUS P4S333
Intel 845
1. Asus P4B266
2. MSI 845 Ultra-AR
Intel 850
1. ABIT TH7-II
2. Asus P4T-E
Good Luck!