re stainless and non-stick:
Stainless is really expensive and has bad thermal properties. For example, your flatware is probably made of stainless steel. Try sticking a spoon in a cup of really hot soup. The handle of the spoon doesn't really get hot; only the part touching the soup does. That's a great feature in a spoon. It's not so great for a pan, though. Imagine if the only place your pan was hot was directly where the flame hit, while the edges of the pan were cooler.
For this reason, pans aren't made with 100% stainless steel. Instead, they have an interior layer of aluminum or copper. So you get the thermal properties of aluminum plus the looks of stainless steel. But, wait, there's more: aluminum reacts with acid, which can impart an off flavor to acidic food (like tomatoes). So by putting the aluminum inside of stainless steel, you don't need to worry about the pan reacting with food.
Now stainless looks great, I'll give it that. But I don't think it's worth the cost, at least when you are talking about something like All-Clad. Chipping, scratching and peeling are inevitable, and when it's time to buy a new pan, I'd much rather have something less expensive than a $150 pan.