What cookware should I buy?

I need new cookware. I want to buy a good quality type but I have no idea what good quality cookware is. I’m more interested in efficiency over looks and I don't want to spend a fortune. My research is leading me toward heavy thick bottom aluminum. What do you like? P.S. I have Cast iron and I like it.... show more I need new cookware. I want to buy a good quality type but I have no idea what good quality cookware is. I’m more interested in efficiency over looks and I don't want to spend a fortune. My research is leading me toward heavy thick bottom aluminum. What do you like?

P.S. I have Cast iron and I like it. I'm looking for something lighter.
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