OTMOPO3OK is mostly right. So long as your tubing is the same diameter, the velocity of the water is going to be the same at any point in the tubing. Likewise, the pressure drop across the HC and across the WB will be the same regardless of what order they are in. So as far as heat transfer properties go, they will be the same no matter what order they are in.
More important factors are how much flow restriction is caused by bends in the tubing. Avoid those.
There's heat input due to the pump is often overrated, I think, except in cases where people are using huge pumps near the heat output of the processors they're trying to cool. Put the pump before the rad if you know it won't cause more problems with your piping system. Otherwise, don't worry about it.
Alchemy
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