Primordial, Mourning Beloveth, Paradise Lost, etc. I'm looking for metal only, and no metalcore or emocore either. I already know of the more well known obvious answers (My Dying Bride, Forgotten Tomb, Rapture, Saturnus, etc.).
Oh, it doesn't have to be doom. Primordial isn't doom, for instance. I'm glad everyone has had the common sense not to recommend Opeth. hahaDesire and The Fall of Every Season = pretty much what you're looking for. If you're looking to delve outside doom, check out:
Pain of Salvation
Dark Suns
Sepia Dreamer - The Sublime
The 3rd And The Mortal - Tears Laid in Earth
Boris with Michio Kurihara - Rainbow
Doom:Vs - Aeternum Vale
Jesu - Jesu
Morgion - Solinari
Novembre - Novemberine Waltz
October Tide - Rain Without End
HOWEVER!!!!
Pain of Salvation - The Perfect Element
Pain of Salvation - Remedy Lane
Those two are more heartfelt than anything I had recommended above