Okay follow up post:
For thrash...
Add the second Vengeance (name changed to Vengeance Rising) album.
Believer's is either a hit or miss band, they have some good riffs reminiscent of Kreator on their first album but overall it's just okay; if you're going to check them out at all then make sure you get the track Dies Irae from their second album: fucking awesome.
Logo's is good speed metal sometimes bordering on thrash.
Get the second and third living sacrifice album if you like good gritty deathrash and can handle the really monotonous crap vocals. Uhh other death thrash.. Incubus is highly recommended esp for fans of early/mid Sepultura. And Decision D is decent if i recall correctly.
The Crucified is kinda punkish crossover if you like that.
If you like V5's recommendation of Drottnar then check out Absurd2's demo (the 2 is 'squared', not the number 2), and possibly even Extol's album "Synergy".
Tourniquet is proggy thrash.. I've never liked them but they're highly acclaimed within their own christian circles.
For death...
Excurses "Devil's Footprints" demo is decent melodic death. Aletheian is techy melo-death. The two songs Cruciferae released on the "From Kaamos to Midnight Sun" are really good.
For Origin/Hate Eternal style check out Sympathy..
There's also a small brutal death scene with bands like Tortured Conscious and Horsemen of the Apocalypse.
Indwelling has some decent riffs but THAT KICK DRUM IS FUCKING ANNOYING. If you like it check out Death List.
For black...
Lengsel's "Solace" (I heard songs from their new album that's going to be released, it's worthless).
---
If you like Saviour Machine check out Virgin Black.
Pantokrator is pretty good death doom.
---
So ummm yeah, dig around if you're interested, you'll find something worthwhile, if you couldn't care for christian lyrics than i wouldn't bother looking much further than the songs I've uploaded...
Here's a tune from a staple band from each subgenre for people who just want to hear something:
THRASH:
Living Sacrifice - Living Sacrifice (1991) - Violence
BLACK:
Horde - Hellig Usvart (1994) - An Abandoned Grave Bathes Softly In The Falling Moonlight
DEATH:
Mortification - Scrolls of the Megilloth (1992) - Death Requiem
[for V5+admin: these are uploaded to yousendit, the links will expire in 5 days, & 2/3 bands are defunct so there should be no copyright problems]