If you mean a CPU HSF, then I only recommend the Thermaltake Volcano 7+ unless you have the money to buy a Swiftech MCX462.
The V7+ is all copper with a three speed fan switch and the MCX462 has a very thick copper base with helicoid pins made of high quality aluminum inserted into the base. The MCX462 is the best HSF out there but it's not cheap. Base alone goes for $55.00 and with fan goes for between $65.00 to $80.00. The V7+ can be had for $26.00 and up to $45.00 depending on where you buy it.
