I believe some automotive cooling systems are mixed aluminum and copper/brass - so if you use an automotive coolant product you should be OK if you just follow the percentages on the coolant product. Zerex racing coolant, for instance, recommends a 10% mixture and that should be fine.
All that said, yeah, I'd tend away from aluminum radiators as well - but they might work so well that it's worth it to have to bother with an anti corrosion package. BillA says that turbulators are great - and I think these are the only way to get them...
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