The problem with trying to go with a single type of metal is that it is much more difficult. The cheap heatercores are made of aluminum, brass, tin and lead (the tin and lead from the solder). Right off the bat, you are in trouble!
Of course, the best solution would be to use a copper waterblock, a copper radiator/heatercore, and plastic (usually nylon) barbed fittings. It's a pain to do it though.
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