Muscle, your going to need one 120.1 and one 120.2 radiators.
Here is some data as to how each radiator performs: http://www.realredraider.com/vbullet...ead.php?t=4924
If you read the information closely you can see that with the thicker Low Fins Per Inch radiators like the XSPC RX, Thermochill and Black Ice GTX are superior with Low RPM fans. The difference with high speed fans and the Swiftech's slightly higher FPI allows it to match the thicker rads from 1800RPM and above. In reality anything 60CFM or higher will to the trick.
So unless you are going with a quiet setup, the Swiftech MCR Series of radiators is what you need. Inexpensive, slim to fit in the case, but holds it's own against the big boys. If you have to buy anything get a Thermochill. Be advised you are going to need G3/8 to G1/4 adapters or G3/8 fittings.Edited by iamthelaw - 5/19/11 at 1:51pm