I agree with what everyone else has said so far. The majority of your cookware should be a stainless/copper/etc finish and the rest should be a couple of non-stick pieces.

The only non-stick piece of cookware I use is a Calphalon wok. I'd definately buy more of their stuff if I ever needed it because their warranty is great! The one time I had a defective piece (flaking), they allowed me to exchange it in the store for a new one.