[pavulon]

There are several commercially available "premixed" coolant/antifreezes. Last fall I had my Ducati (aluminum radiator also) serviced and filled with a product form a company called Silkolene.
If you're asking me (I know you're not), I would also spend the extra few $$ and flush with distilled water thus avoiding silicates and phosphates which can precipitate on surfaces, impede heat transfer and expedite pump wear. Of course, this may be a bit "anal" but I guess if I'm gonna go through the trouble of doing something, I try to do it as well as I can.
Scott