We use Calphalon professional - I highly recommend it. It is a heavy, anondized, cast aluminum alloy. It distributes heat very evenly & is tough as it comes. It's pricey, but in my opinion, worth every cent. The only thing is, you'll have to have a stainless steel pot/pan for acidic foods, which you should never cook in aluminum, anondized or not.
I am trained as a Chef (although I don't work in the business anymore) & cook alot, so quality cookware is very important to me.