assuming youre not close minded, and although unfamiliar...are willing to try some new things, then i think i can help you. you won me over with the anti-dimmu, pro-morbid angel thing as well, so...here are a few bands you probably wont hear name dropped over and over in this thread, which is bound to happen to many band names....
Death Metal:
Autumn Leaves (phenominal, but semi melodic death metal, late 90s)
Solstice (death in the florida vein, great riffs, good vocals, classic sound)
Demigod (fantastic watershed album. pretty innovative for its time)
Black Metal:
Silencer (a bit of an aquired taste, similar to bethlehem, very emotive)
Fleurety (fairly advant garde, about as creative as bm got back then)
Keep of kalessin (start out with the reclaim EP, one of my all time favs)
Doom:
Celestiial (dark, brutal, melodic and tons of funeral atmosphere)
Worship (highly cult band, and for a good reason. phenominal)
Dolorian (the epitome of surreal dark atmosphere, a must hear)
Classic/thrash:
Angel Witch (assuming you havent heard em, great nwobhm)
Hypnosia (a 3 piece thrash band from australia, but quite good)
Manilla Road (fun and classic. the vocalist may take a few tries, but hes great)