I'm not much of a metal-head since High School, but I still listen to Maiden like crazy. I only like Metallica's RTL, MOP, and AJFA. I own every Pantera album made, including the live album and DVDs. I own every KoRn album ever made, though I don't really think their last 4 albums were as good as their first 5, and they were only heavy on the first 2.
I listen to Down, Crowbar, and Electric Wizard for newer metal.
I never cared for Slayer, but I do like Megadeth occasionally. I blast Holy Wars more than any human being should.
I don't really like hair metal or glam metal. It has to be really heavy for me to like it.
I think Deep Purple is the closest thing to classical music, metal has every come. Symphonic Metal bands fail at it.