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That way I would have the heat absorbsion of Copper and the quick cooling of Aluminum. That way I can have the best of both worls and still keep the price down.
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Thats Bad Physics. Al does NOT release heat faster then Cu!
Again say it with me: in a closed system, specific heat capacity does not effect the overall thermal resistance of the system.
However Al is much easier machined, is lighter, and cheaper. So while Al is not a bad idea, it will not help with cooling performance compared to Cu assuming all other factors are equal.
And I personally would not buy a block that has both Al and Cu in direct contact with the water. If you go that route, I would have to see that at least some annodizing or some such precation was taken.