It would of been impossible to test all these heatsinks on a CPU. So I decided to use a technique, which I first saw at 2cooltek. Instead of a CPU, a peltier unit is used for the heat source. Slap the heatsink on the hot side of the peltier and a thermometer on the cold side. The difference between ambient temperature and the cold side of the peltier represents the heatsinks performance. Here is a picture if my test board with the Golden Orb running:

On the left you can't see the 250w power supply, which powers the peltier, and the fan(s). On the board is the Golden Orb, which sits on top of the 68w Hitech peltier unit, which can be found at 2cooltek. Then there are the 2 CompuNurse thermal probes, which I got from the CoolerGuys. One of the probes is under the peltier, measuring the cold side temperature. The other one measure the ambient temperature all the thermal pads where removed from the heatsinks and replaced by Arctic Silver thermal goo provided by Nerdsbyte.

This is probably the most precise test you can do at home. However, I don't believe it is 100% perfect. First of all, the CompuNurse has an accuracy of 1ºC. Then there is the amount of thermal paste used and the pressure between the peltier and heatsink. There are also ambient factors like air drafts and ambient temperature. Now that this is said, here are the results I got using the heatsinks and their default fan(s):

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