xp-120 would be my best bet... add in a high output 70cfm 120mm fan... you could probably get a 3000+ pass 2.8Ghz (thats when u have a high HTT ceiling mobo)... 3200+ would be good, as the 10x multiplier help alot when you're going for a lower bus speed (under 300 HTT), high clock speed setting.. TBH, I liked 3500+ the most as the 11x multi can breach 2.8Ghz under 270Mhz HTT and its only 150 quids for the OEM.. scrap the retail, xp-120 is the way!... again, 270 HTT will leave u plenty of head space for extra clocking once you decide to go coolant/dry-ice cooling...