Let me point you in the right direction,
Shape of Despair - listen to the vocals on "Shades Of...", they are amazing low growls that sound very scary
Eclipse Eternal - (black metal) - I think they have one album out, highly recommended, they have furious satanic vocals and are a pretty good band
Garden of Shadows - very good low growls
Burzum
Demlilich - death metal
Edge of Sanity
At the Gates
Thorr's Hammer - doom metal with low pitched vocals
Khanate - doom metal with screaming vocals
also:
FUCKING Deicide!!