Thas going to be a hard cpu to cool being a Prescott especially in such a small case. Cooler Master EIU-S61FS-01 may be some help but i'venot looked at it thoroughly.
There used to be a low-profile copper cooler with a Delta Fan on it, ~8500-10,000RPM. That would do the job! Don't know where to find 'em though... I'll keep searching and post it if I can.