If i may add, you can use just the Black ice rad. Or the swiftech if you don't have any other choice for the res. The heat amount your cpu block can transfer to the water per second is the limiting factor here.
I have the same rads, and using an ek supreme hf, 3x mcw60 and a mcp355, they can keep cool (gpu at 43-44c and cpu at high 50s) 3 gtx 460 and a 4,41 ghz i7 970 at 1,45v.
That is where my "overkill" argument came from...
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