Carcassian
Utopian Blaster
It seems that you consider Black Sabbath doom metal just because they did slow songs. Am I right? If I am, you should notice that it's not a great reason really. I have heard the first albums by BS with Ozzy, don't worry about that. Have you studied music? I ask because if you have I can tell you whatever you want to know.
If I may, I think Sabbath are considered the first Doom band as they created the aesthetic and the musical and lyrical basis for the genre. The sense of well...doom, the religious discussion (almost always as a warning or veiled pro-christian sentiment), the slow power chords and blues based rhythm work.
I wonder who you consider to be a doom band ? It seems folly (to me) to not consider Candlemass clearly following in a vein created by Sabbath.
