Re: Heatsink on E6600?
Currently, the Thermalright Ultra-120 that cabbspapp linked to is the best air cooler out there. It's big though.
The stock heatsink is great (for a stock heatsink). Don't except awesome overclocking out of it, but you will be able to push it a little. I can't personally say anything because I immediately put on my Tuniq Tower 120, but I have heard enough about it.
C2D E6600 | 4GB DDR2-800 | 9800GTX+ | Asus P5B-E | 150GB Raptor | 320GB 7200.10 | 750W Xigmatek PSU