The Asus P5B Deluxe will probably get you the highest fsb (although there are new boards like the rev. 3.3 Gigabytes that may beat it).
abit's AB9 QuadGT will do 500fsb+ on the 1067 strap rather than the looser 1333 that the P5B switches to ~400fsb so clock for clock it's faster but I think that the P5B with your cooling would get you enough extra fsb & hence coreclock to beat it's performance.