My first thought is that your entire top 4 is stuff where I'd prefer a different album from the same band <_< Leprosy for Death, Schizophrenia for Sepultura, Altars of Madness for Morbid Angel and Obsessed by Cruelty for Sodom (especially if I cheat and add In the Sign of Evil since they've been re-released together anyway). You're one of the few people that agrees with me on Iron Maiden and Metallica's best albums though.
Anyway I don't have a clear cut list of favourites but I'll make a list anyway. Everything after the top spot is essentially unordered and just listed as it comes to mind. Also doing one album per band for fun, probably not that many bands who would make the list twice anyway though
1. Dead Congregation - Graves of the Archangels 2. Gorguts - The Erosion of Sanity 3. Morbid Saint - Spectrum of Death 4. Beherit - Drawing Down the Moon 5. Satan's Hallow - s/t 6. Primordial - Redemption at the Puritan's Hand 7. Chastain - The Voice of the Cult 8. Samael - Ceremony of Opposites 9. Judas Priest - Painkiller 10. Mortem - The Devil Speaks in Tongues 11. Chapel - Satan's Rock and Roll 12. Demolition Hammer - Epidemic of Violence 13. Deathwish - At the Edge of Damnation 14. Tribulation - The Horror 15. Sodom - In the Sign of Evil/Obsessed by Cruelty 16. Queensryche - Operation: Mindcrime 17. Pseudogod - Deathwomb Catechesis 18. Riot - Thundersteel 19. Morbid Angel - Altars of Madness 20. Mgla - With Hearts Toward None 21. Immortal - Pure Holocaust 22. Immolation - Failures for Gods 23. Fates Warning - Awaken the Guardian 24. Exorcist - Nightmare Theatre 25. Demon - Night of the Demon 26. Iron Maiden - Somewhere in Time 27. Electric Wizard - Witchcult Today 28. Deathevokation - The Chalice of Ages 29. Cormorant - Dwellings 30. Witchfinder General - Death Penalty 31. Candlemass - Epicus Doomicus Metallicus 32. Metallica - Kill 'Em All 33. Mercyful Fate - Melissa 34. Unanimated - Ancient God of Evil 35. Tyrant - Too Late to Pray 36. Slayer - Hell Awaits 37. Artillery - By Inheritance 38. Demilich - Nespithe 39. Deiphago - Satanik Eon 40. Dominus Xul - The Primegeni Xul (I Condemned My Enemies)
Definitely feel like I overlooked some stuff but whatever, any time I make a list like this it ends up being something I could look at a week later and change half the stuff on it and be just as satisfied