There are a handful of good websites offering heatsink reviews, and Frostytech.com is certainly one of the best. Frosty have tested out a new heatsink from a company called Xigmatek, if you think Thermaltake is the best there is, you need to read this review of the HDT-SD964 CPU Cooler!
"The Xigmatek HDT-SD964 is a potent CPU cooler because it puts four copper heatpipes in direct contact with the processor. The technique is called 'Heatpipe Direct Touch,' and for today's class of heatspreader capped processors it's one of the best means of keeping the CPU running cool. In this review Frostytech will be testing the thermal and acoustic performance of the Xigmatek Co., Ltd. HDT-SD964 heatsink for you. By the time we're done you'll know how well it works on AMD & Intel processors, and how loud or quiet it operates."