i use a thermalright SLK-900A with a 92mm panaflo H1A 56.8cfm fan. its a great combo, and should cost ~$35 shipped at
www.jab-tech.com. it keeps my OCed 180+ nice and cool. it idles around 26C at stock speed (1533MHz) and stock Vcore (1.5V).
right now at 1.73V and 2403MHz im at 30C idle/38C load.