Haven't used a heatsink/fan for a while but I suggest something like the Swiftech MCX462 (providing you have 4 mounting holes around CPU), Thermalright SLK-800, Volcano 9 or something in that class. Then get a fan around 3900-4500 RPM (I think all those heatsinks use an 80mm fan) and unless you're deaf stay away from the 7000 RPM highspeed fans because they are way too loud.