Currently, I can get my 2.4c up to around 3ghz before it starts getting unstable/high temps, with stock intel cooler. I would like to try and go further, so I plan on buying a cooler. I am torn between the Zalman 7000A AlCu (cheapest), Zalman 7000A Cu (more expensive, not sure how much of a difference there is between this and AlCu), and the SP94 with a tornado (heard some good things about this, but it is hideously expensive). At first, I was just going to get the AlCu Zalman, but after hearing about the praises of the SP94, I am wondering if the price difference is worth it?