Haven't read every single post in this thread, so I'm sure some of these have been mentioned; and maybe more than once.
Nevermore - The Politics of Ecstasy, Dreaming Neon Black, Dead Heart in a Dead World, This Godless Endeavour.
Opeth - My Arms Your Hearse, Morningrise, Still Life, Blackwater Park, Ghost Reveries, Watershed
Mercyful Fate - Melissa, Don't Break The Oath
King Diamond - Abigail, Them, Conspiracy, The Eye
Iron Maiden - Number of the Beast, Piece of Mind, Powerslave, Somewhere In Time, 7th Son of a 7th Son
Bruce Dickinson - Accident of Birth, The Chemical Wedding
Iced Earth - Burnt Offerings, Days of Purgatory, Something Wicked This Way Comes
Wolf - The Black Flame
Crimson Glory - ST, Transcendence
Demons&Wizards - ST
Ihsahn - The Adversary, Angl, After
Forbidden - Forbidden Evil, Twisted Into Form
Into Eternity - Buried in Oblivion, The Scattering of Ashes
Scar Symmetry - Pitch Black Progress, Holographic Universe
Epica - Design Your Own Universe
The Sword - Warp Riders
Mastodon - Remission, Leviathan, Blood Mountain, Crack the Skye, The Hunter
Blind Guardian - all of their albums
Persuader - The Hunter, Evolution Purgatory
Testament - Dark Roots of the Earth