Here's the full list of what I've heard/owned from 1998:
Angelcorpse - Exterminate
Angra - Angels Cry / Holy Land
Dawn - Slaughtersun: Crown of the Triarchy
Emperor - Emperor / Wrath of the Tyrant
Jungle Rot - Darkness Foretold
Primordial - A Journey's End
Suffocation - Despise the Sun
Amon Amarth - Once Sent From the Golden Hall
Morbid Angel - Formulas Fatal to the Flesh
Gorgasm - Stabwound Intercourse
Liquid Tension Experiment - Liquid Tension Experiment
Blind Guardian - Nightfall in Middle-Earth
Katatonia - Discouraged Ones
Incantation - Diabolical Conquest
The Chasm - Deathcult for Eternity: The Triumph
Opeth - My Arms, Your Hearse
Yattering - Human's Pain
Mercyful Fate - Dead Again
Slayer - Diabolus in Musica
Gorguts - Obscura
Iced Earth - Something Wicked This Way Comes
Death - The Sound of Perseverance
Bruce Dickinson - The Chemical Wedding
Napalm Death - Words From the Exit Wound
Bolt Thrower - Mercenary
Meshuggah - Chaosphere
Eldritch - El niño
Nile - Amongst the Catacombs of Nephren-Ka
Some of these might sneak into the Top 10 (Gorgasm, LTE, Dawn) after another listen or two