Cook's Illustrated / America's Test Kitchen does extensive testing of cookware and gives their recommendations for the best quality pieces. They unanimously recommend All Clad, but it's outrageously expensive. Their next-best recommendation is almost identical for a fraction of the price. Tramontina Tri-Ply cookware. The same specifications as All Clad, at a very affordable price. I love mine.
You can get this at online at WalMart.com, but it is rarely found in stores. WalMart stores usually carry the regular (not nearly as good) Tramontina single-ply stuff. You can use the Ship-To-Store option for free shipping from WalMart.com and pick them up at your local store. Just be SURE you are getting the "Try-Ply" version. You can buy in sets or individual pieces. I cannot recommend them enough. Every time you pull it out, you feel like you're on a television cooking show set. They are gorgeous. Like a good cast iron skillet, these pans are the type of item you will use for the rest of your life.
Tramontina Try-Ply 12-inch Skillet - $49 Tramontina Try-Ply 8 Piece Set - $139
The fabulous cooking website Serious Eats also confirms that the Tramontina is the best skillet on the market for the money.
Serious Eats: All-Clad vs. Tramontina Try-Ply