i am looking for cookware, and i have decided that 18/10 stainless (with a sandwich bottom for heat conduction) is best for my needs and budget. most of the cookware has an aluminum core in the bottom, but i have come across a set that has a copper core instead. The reviews i have read about the copper core on this brand are really outstanding. however, the same company also makes a line with aluminum core that has a bit higher Suggested retail price and is entitled "chef's classic." this gives me the impression that the aluminum core is better. i haven't really found any other sets with a copper core (not bottom) other than this- so there is not a lot of information to compare the two. i read that both copper and aluminum are good heat conductors and a thicker core is good for even better heat distribution (which you can find with aluminum). is one significantly better than the other?