Essential Stoner/Doom?

Tummler - Early Man
Tummler - Queen to Bishop IV
Sleep - Volume 1
Sleep - Sleep's Holy Mountain
Witch - Witch
Trouble - Manic Frustration
 
Doom in general or sub-genres as well? Also I second Manic Frustration. You also want to check out Witchcraft's S/T if you haven't already.
 
Minsk - The Ritual Fires of Abandonment
Minsk - With Echoes In The Movement Of Stone
 
blind dog - captain dog rides again
bongzilla - gateway
bongzilla - amerijuanican
warning - watching from a distance
atomic bitchwax
grand magus

I'm assuming the OP meant he wanted stoner doom metal...not stoner metal or doom metal. Almost everything you listed is good... but I'm not sure that's what he wanted at all. o_O