You know what
Black Sabbath - Paranoid
Iron Maiden - The Number of the Beast
Metallica - Master of Puppets
Dream Theatre - Metropolis Pt. 2: Scenes From A Memory
Venom is worthy, but I can't in good conscience not rep prog metal when it's a huge part of my musical tastes. Scenes From A Memory is still a template a lot of gifted groups strive to reach. It's a worthy representative for the more technical and melodic side of metal.
Shine on, you crazy diamond.