i put in an xp 120, and although its large, it fit with the heatpipes against my xms pro ram. i added some better case cooling, and here are my temps. Mind you, i live in the pacific, and room temperature is probably 72F-75F. With cooler air temps this may improve even more:
STOCK SOPRANO CASE COOLING / STOCK FX-55 HSF (130nm)
MOBO CPU GPU AMBIENT GPU CORE
IDLE 39C 47C 44C 45C
LOAD 49C 66C 55C 74C
XP-120 W/BETTER CASE COOLING (+ 2 120mm FANS)
MOBO CPU GPU AMBIENT GPU CORE
IDLE 32C 39C 37C 37.75C
LOAD 35C 55.5C 51C 65.75C (MAX, FAR CRY/BF2 AT 62C)
IMPORTANT TO NOTE: THE XP-120 FAN COOLS THE ENTIRE BOARD EXTREMELY WELL, NOT JUST THE CPU. THE CASE COOLING AFFECTED ALL TEMPS, BUT ON THE CPU IT DROPPED ONLY ~3C. (FROM 34C/41C TO 32C/39C). ALSO, THE THERMAL CERAMIQUE IS STILL LESS THAN A WEEK OLD (THERMALRIGHT SUPPLIED, I'V NOT NOTICED ANY DIFFERENCE FROM SHIN-ETSU).
THE PANAFLO IS THE FRONT INTAKE. IM USING A CRYSTAL LED (69CFM) FOR THE HS)