Some favs:

Death Metal:
Nile
Vital Remains
Death
Odious Mortem
Hour of Penance
Cryptopsy
Obituary

Black Metal:
Emperor
Immortal
Gorgoroth
(old) Burzum
1349
Carpathian Forest

Grind-ish stuff:
Carcass
Impaled
Nasum
Wormed
Splatterhouse
Skinless