Also, if you know that you have good ventilation in your case and you are realy conserned about noise, you can always get a adapter and run an 80/92mm fan on a 60mm heatsink.
I did that to a Duron where I was going for COMPLETE silence; replace the 60x20mm fan on a CoolerMaster heatsink with a Vantec Stealth 80mm fan and an 80mm to 60mm adapter. Worked great! If you use a decent 80mm fan, it will still be quite and provide a LOT more air circulation for that setup.
Again make sure taht the block is on securely and you have adequete airflow in your case.
BTW you can always go to watercooling like I did