Corsair Dominator Series 4 GB DDR2 Kit 1066 MHz CL5 @ techPowerUp
 

The Corsair Dominator Series of 4 GB kits does not only manage to deliver a great overclock but also offers exceptional performance at lower speed settings, making this a kit for almost every scenario. Its attractive price of $125 is a very affordable way to get into the 4 GB club while still being able to run serious overclocks.