Just buy a Northwood C chip. Your board will support the 2.4C, 2.6C, 2.8C, 3.0C, and 3.2C. You honsetly aren't missing a thing by not being able to run a 3.2E instead. As has been mentioned, it will cost you a bit more for the Northwood now that Intel has lowered Prescott prices. But in your case, no biggie, as you have many great performing CPU's to chose from priced from about $145-$245 in the USA for a retail box version. A 533 bus Prescott would be a big mistake IMO.
ABIT IS7, P4 2.6C, 1GB Corsair XMS 4000 Pro Series, Radeon 9800 Pro, Santa Cruz, TruePower 430watt