I run an Aquastealth II with AquaCoil upgrade radiator (cube style). It has a Panaflo 120mm H1A on it.
My overclocked P4, idles at 2-3C above system, and tops out at 11C over system. Typically, that is 35-36C. It has been warm in my house the last few days and I have seen a 39C. (Don't have my swamp cooler ready yet, as it still freezes at night.)