Pink Floyd - Live at Pompeii
Metallica - Master of Puppets
Sepultura - Chaos AD
The Rolling Stones - Sticky Fingers
Led Zeppelin - III
Honorable mention I agree with @PhoneyIommi that Clutch - Blast Tyrant deserves mentioning, as do Robot Hive/Exodus, and Earth Rocker. I would toss Monster Magnet - Monolithic Baby and Power Trip, as well as Orange Goblin --Time Traveling Blues, Thieving From the House of God, and A Eulogy for the Damned on that level as well. Such a huge sounding albums. Ohhhh, and Mastodon on Leviathan and Crack the Skye. Soundgarden - Badmotorfinger and Superunknown.