No one metal is ideal for all kinds of cooking. Slow cooking is best done in enameled cast iron (such as Le Creuset). Delicate sauces are best done in stainless-lined copper (such as Bourgeat). Boiling in large quantities of water (corn, lobster, ...) can be in just about anything; cheap light aluminum in particular will work fine, although it won't last very long. Heavy aluminum is better, although stainless looks nicer. If your goal is aesthetic, you might look into Alessi's cookware set. Each piece is made in a different, and appropriate, metal. They were designed by leading chefs in collaboration with Richard Sapper, Alessi's top designer. They should cook very well, and they look great, but they are very expensive. If your goal is strictly culinary, I would go down to a commercial kitchen supply place, and get some copper-bottomed stainless saucepans, some extra-heavy aluminum skillets lined with Silverstone, a couple of aluminum stockpots, and so on. -s