THat Zalman CNPS7700 is probably the best all around heatsink/fan combo you can get. It's got the large 120mm fan on it. It's fairly quiet and has a pretty good review by most people who uses it. I wold definitely try the Zalman if I need it. I'm running pretty cool on stock fans.
RIght now, I'm checking my CPU temp. It's running at 29 degrees Celsius. Temps been getting cooler as of late because the heat wave in SoCal has gone by, hopefully.