That loop will be good for the X2.
I think you get around 1 litre of the primochill, that will be just about enough when you include the RES. With an MCR220 integrated and an apogee GT block I used about 600ml.
If you've got your heart set on black coolant then stick with it. Personally I like the Hydrx additive which you mix with distilled water-although it is green which is not to everyones tastes.
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Xeon 3350/E6750| DFI X38 LT| 2 x 4870|74gb Raptor
Thermalrock Dragon Case (sprayed black)
CPU loop: MCR 220 int.|Apogee GT| MCP655
GPU loop: MCR 320|Swiftech Res.|2x EK FC blocks| MCP655.
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