Seeing as I really, really LOVE to make "top 10" lists (for some unknown reason), I guess I'll post mine as well. Nothing truly unknown or "cult", though. Along the classics is where my heart rests.
1. Immortal - Pure Holocaust
2. Darkthrone - Transilvanian Hunger
3. Burzum - Hvis Lyset Tar Oss
4. Bathory - Blood Fire Death
5. Darkthrone - Under a Funeral Moon
6. Immortal - At the Heart of Winter
7. Mayhem - De Mysteriis Dom Sathanas
8. Dimmu Borgir - Stormblåst
9. Burzum - Filosofem
10. Emperor - In the Nightside Eclipse
I have a lot of love for my new-found bands as well, such as Summoning, Nokturnal Mortum, Weltmacht, Deathspell Omega, Helheim, Hirilorn, Empyrium, Drudkh, Weakling and so on, but they'll never beat the true originals. Also, honoroble mentions goes to the following that almost made the list:
Satyricon - The Shadowthrone
Darkthrone - A Blaze in the Northern Sky
Enslaved - Vikingligr Veldi
Enslaved - Frost
Gorgoroth - Pentagram
Gorgoroth - Antichrist
Dimmu Borgir - For All Tid