DDC is the only way to go. It's quiet, small, and it's built for 3/8" ID tubing. It's got plenty of head, which is somewhat important for a restrictive loop like yours. The G4 is more restrictive than any other widely available commercial waterblock (I know they have much more restrictive designs in Europe), except for the NexXos XP, so the extra head is well worth it, especially considering you'll have two more blocks in the loop in addition to the G4.
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