I own their first two albums, but I own the reissues under the Opprobrium moniker (they changed their name to avoid confusion with the alternative rock band Incubus).
I also own Discerning Forces (their 2000 release and the first under the Opprobrium moniker) and The Fallen Entities.
I like Beyond the Unknown best.
Here is how I rank their albums:
1. Beyond the Unknown
2. Serpent Temptation
3. Discerning Forces
4. The Fallen Entities
5. Mandatory Evac
Great band! My favorite song of theirs is "On the Burial Ground" off of Beyond the Unknown.