Well, I have something of a Maiden list floating around in my noggin:
1. Hallowed Be Thy Name
2. 2 Minutes to Midnight
3. Revelations
4. Paschendale
5. Powerslave
6. Wasted Years
7. The Number of the Beast
8. Ghost of the Navigator
9. The Clairvoyant
10. Killers
Honorable mention has to go out to Aces High, The Evil That Men Do, Wasting Love, and Infinite Dreams here. Just no room for 'em.
EDIT: Hell, here's the rest of my top 5 bands. None thought terribly hard about.
Clutch:
1. Spacegrass
2. Animal Farm
3. White's Ferry
4. Burning Beard
5. Drink to the Dead
6. The Elephant Riders
7. Cypress Grove
8. Ghost
9. A Shogun Named Marcus
10. The Soapmakers
Opeth:
1. Deliverance
2. Ghost of Perdition
3. Windowpane
4. Face of Melinda
5. The Night and the Silent Water
6. The Leper Affinity
7. Bleak
8. Black Rose Immortal
9. A Fair Judgement
10. Blackwater Park
Mastodon:
1. Workhorse
2. March of the Fire Ants
3. Hearts Alive
4. Blood and Thunder
5. The Wolf Is Loose
6. Iron Tusk
7. Mother Puncher
8. Colony of Birchmen
9. Sleeping Giant
10. The Last Baron
Rush:
1. Hemispheres
2. 2112
3. The Pass
4. Xanadu
5. Freewill
6. The Spirit of Radio
7. Subdivisions
8. Limelight
9. Distant Early Warning
10. Anthem