any heavy pan is good. gas is very forgiving of warped pans because the flame doesn't care. GLasstops need flat stable pans. Heavy pans (thick metal) tranfers heat better and more evenly. THus AllClad, Calphalon, Le Creuset etc got their reputations and many others Revere Ware for instance lost theirs. You can buy a set if you find the right price, or you can shop for individual pieces as you find the need. MAybe your old pans are just fine and you want to add a few new ones. Ask around here, check out several store and see em for yourself.