Going through my ipod, here are some of the best (imho)
Death Metal,
The Acacia Strain (tech death)
Anata (tech death)
At The Gates (gothenburg death)
Atheist (Thrash death)
Cannibal Corpse (brutal death)
Cattle Decapitation (brutal death/ grind)
Cephalic Carnage (brutal death, grind, everything death)
Cryptopsy (classic death)
Cynic (experimental death)
Death (classic death)
Frederik Thorndal's Special Defects (from meshuggah, tech death)
Gojira (progish tech death)
Gorguts (obscura- experimental death)
Hacksaw to the Throat (thrash death)
Ion Dissonance (tech death)
Martyr (classic death.thrash)
Necrophagist (brutal death)
Nile (awesome brutal death)
Pitbulls in the Nursery (brutal/tech death)
Psycroptic (brutal death,thrash)
Sepultura (classic death)
Spawn of Possession (tech, brutal death)
Black Metal,
1349 (filthy black)
Akercocke (blend of black and death)
Anaal Nathrakh (filthy black)
Arcturus (experimental black)
Blacklodge (industrial black)
Blut Aus Nord (atmospheric black)
Dimmu Borgir (prog black)
Emperor (classic black)
Enslaved (viking black)
Ephel Duath (the first album)
Keep of Kalessin (viking black)
Primordial (doom black)
Red Harvest (industrial black)
Satyricon (classic black)
Ulver (older albums, classic black)
Ved Buens Ende (doom black)
Zyklon (blend of black/death)
other "essential" Metal/Noisy Guitar bands,
Agoraphobic Nosebleed (grindcore)
Behold... The Arctopus (instrumentalness)
Botch (hardcore)
Burst (post-hardcore)
Converge (noisy hardcore)
Cult of Luna (doomy hardcore)
Earth Crisis (vegan hardcore)
East West Blast Test (avantgarde hardcore)
Ephel Duath (rest of thier stuff, avantgarde hardcore )
Ghengis Tron (cybergrind)
Impaled Nazarene (blend of rock and roll, black metal and satanness)
Isis (doomy awesomness)
Knut (hardcore metal)
Kylesa (not definable, awsome guitarness)
The Locust (noisy)
Mastodon (battle metal)
Meshuggah (tech metal)
Mouth of the Architect (doomy hardcore)
Mr Bungle (avantgarde)
Napalm Death (grindcore)
Neurosis (doomy awesome hardcoreness)
Nostromo (f'ing amazing noisy hardcore)
Obsidian (tech metal)
The Ocean (collaberative hardcore)
Old Man Gloom (collaberative apocayliptic hardcore)
Orchid (screamo)
Othrelm (noisy instrumental)
Pig Destroyer (grindcore, harsh metal)
Rosetta (doom hardcore)
Saetia (original screamo)
Sikth (experimental metal)
Sunn O))) (sludge/drone/doom)
Textures (hardcore)
Tusk (hardcore)
disclaimer,
genre definitions are my own, when i say hardcore, i dont mean 'MTV, Scuzz, Popular' Hardcore, its more in the classical 'harder than metal' hardcore.
i tried to keep the list short, but hey. i love each and every one of the above bands. I tried to cover a wide variety of noisy guitar genres, with the exeption of power/prog (Enverxis will be able to reccomend from that genre, its not my thing), and keeping it heavy.
have fun!!!