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Theoretically, you can use either metal, but the design should be slightly different (i.e. baseplate thickness, fin width,...) in order to compensate for the different heat density/thermal resistance, and if you look at the figures, you'll find that Alu will give you a lower heat dissipation than copper, but you should be able to compensate for that, a bit, with a big pump. -BigBen2k
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Actually, I would like to point out a small correction to the ALU CU argument, I don't know if it will change much though. Copper absorbs heat better, and Alu will dissipate better. So Copper on the bottom, with Aluminum to draw out the heat should be best. A block of either in whole would agreeably have entirely different concepts of design. If I am wrong, I appologize.
Take in consideration the newer swiftech air block that uses a copper bottom w/alu pins to release the heat.