Well, unless you're trying to pitch a new product, I disagree. In fact I disagree anyways!
If you're going to go with heatpipes, you might as well go with phase change cooling, and that's a whole different ballgame.
In order to "as fast as possible transfer all heat from the center of the block, to a bigger surface" is accomplished with fins. Copper is a limitation, but the only affordable solution.
The fin pattern may be optimal in a straight-through design, but that assumes an even heat source. This fin pattern has the same characteristics as a straight one, with one fundamental difference: the coolant speed is much higher in the center, where most of the heat originates. Optimal flow, for an optimal fin pattern.
Update: 3/16 is the nozzle of choice, for the moment. Still running the thermal calculations (spent a weekend with a cold).
Utabintarbo and I are going over minor details for the block, mount and seperating res. I've spec'ed out most parts, and will start purchasing soon. Polycarbonate top.
In the mean time, here's an example of Utabintarbo's excellent work: an AMD Athlon, rendered with all the pins!