How many waterblocks are in your system? I would say if you're just running one cpu block then dont waste your money on running a second radiator and a second pump, because the cpu block cannot generate enough heat to warrant the practical use of a second radiator / pump.
Now if you're planning to go all out and have a cpu block, a gpu block a northbridge block, a hd block, etc... then you could benefit from running 2 rad's in parallel with two pumps. BTW, if you do run 2 pumps and if they will share the same resevoir together then run equal gph pumps. If they're independent closed loops then it doesnt matter.
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