I started out with the typical bands
Cathedral's 3rd album The Carnival Bizarre was an early one for me. I absolutely love the feel of this album and Night of the Seagulls based on the movie of the same name is a classic piece of Doom.
Black Sabbath's 3rd album Master of Realityis a must listen along with Volume 4. Some of the best songs ever recorded are on these two albums: Sweet Leaf, Children of the Grave,Lord of This World,Supernaut,Snowblind,St. Vitus' Dance.
Electric Wizard has had a solid discography starting the self-titled Electric Wizard with solid tracks and clean vocals - standouts are Stone Magnet, Mountains of Mars, and Behemoth. After this solid effort they went with some fuzzy vocals and got even heavier - Come My Fanatics and Dopethrone are absolute must listens. So many great songs with Son of Nothing,Wizard in BlackVinum Sabbathi, and Funerapolis.