All those mentioned above are good. I would add to the mix the Thermaltake Silent 939 ( http://www.thermaltake.com/coolers/cl-p0200silent939/cl-p0200.htm ). As it offers good performance at near absolute silence and has no issues with fitting on any board, cause if the stock one fits, then the Silent 939 fits. I couldn't find the Silent 939 on line, but it can be found at CompUSA for 25-30 (depends on the manager).