You even know about the True Khazad Doom. I have nothing that you probably haven't already heard. Maybe Pallbearer from Arkansas?
True Khazad Doom? Sounds pretty like something made by a bunch of gay men. Haven't heard of Pallbearer, listening to a song on youtube right now. Edit: Digging the vocals, very Ozzy like.
I dont hear much talk about thunderstorm. witchunter tales is pretty awesome, although you may already know them. Maybe raven black night?
One of the dudes behind Thunderstorm has a new project out called The Temple of Pain. Kinda cheesy name, but the music is pretty cool.
Can't guarantee the quality of all of those bands but: The Doomsday Cult Millarca Bud Tribe Doomshine Litany Angel of Damnation Life Beyond Great Coven
I dunno how they compare to the other stuff you listen to, or how well known they are, but check out Horrors of the Black Museum?