The Drowned Productions pressing of Slumber of Sullen Eyes still pulls upwards of $100 on ebay for a reason. One of the best cult DM records ever. Shadow Mechanics is also great, albeit quite different.
A collossal prog/grind/death mindfuck from the Czech Republic. From Higher Will, Pod Vladou Bice and Order & Punishment are equal parts brutality, innovation and playfulness.
More noteworthy for their popularity and over-the-top image than innovation or evolutionary significance. But there's no denying that Satanica, Thelema.6 and Zos Kia Cultus are great albums.
Blackened death metal stalwarts. The Nocturnal Silence, Bloodhymns and NecrophobicHrimthursum are all top-notch albums. Would be higher on this list if Darkside and The Third Antichrist weren't relatively lacking.
Though they've been playing watered down gothic Eurotrash bullshit for 15 years now…