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The Raystorm for a CPU/GPU loop. Very similar results to the HD at a better cost with less flow restriction.
If its just a CPU loop though, the HD has top notch thermal transfer.
IIRC, the mounting mechanism on the AC block is a bitch.
Between the Apogee HD and Raystorm, the HD supposedly has a little better thermal performance, but the Raystorm is less restrictive. With your pumps, though, restriction is essentially a moot point.
Just because he is gonna have obnoxious head pressure doesn't mean his flow will be good with an HD.