what exact model do you have? also your case (for room) and budget.
My heatsink and fan is the thermaltake TR2 R1 Tt and my case is a midsize ATX tower ram cpu and power supply are fairly close to each other
Mobo ASUS M4A785-M
RAM PC-6400 4GB 800 mhz
PSU is Thermaltake Tough Power Grand 650W 80 Plus Gold Certified