DFI, as mentioned above. Or Abit NF7-S v2 (not the NF7-S2)
The DFI considered good for reaching high FSB speeds in excess of 200mhz
The Abit considered best for high CPU OC's (FSB speeds generally tops out at 215-220 mhz with stock BIOS, modded BIOS can go higher).
Fern