Saint Vitus. I only like their first two albums with Reagers though but they mean a lot to me.
Trouble is a close second. I like many of their albums but The Skull is the strongest for me.
I like Pentragram too but not as much as most doom fanatics I guess.
"The very Hemoglobin of a persons blood is based on IRON! The same Iron in the earth that you turn into STEEL, that is in everyone." -Michael Coffey, Stone Vengeance