New to metal

[Ninjavenom]

Nile, Cannibal Corpse, Cryptopsy, Deranged, Devourment, Dissection, Exhumed, Hate Eternal, Hypocrisy, Immolation, Incantation, Autopsy, Mortician, Aborted, Mastodon, Avulsed, Obituary, Deicide, Bloodbath, and Death are some good Death Metal bands.

For doom, my only real sources are Candlemass and Black Sabbath. (i'm open to any doom suggestions here, since the request is already open)

Epic Metal is where Rhapsody, Manowar, Thyrfing, Tokyo Blade, Jag Panzer, Helloween, Dark Moor, Therion, Nightwish, and Gamma Ray come in.

Good black metal/black metal-ish kind of bands, you'll want In Flames, Dark Tranquility, Opeth, Bathory, Hellhammer, Impaled Nazarene, Kalmah, Arch Enemy, Nargaroth,

For thrash, look to Megadeth, Sodom, Onslaught, Malevolent Creation, Sepultura (old stuff), The Crown, Tom Angelripper, Kreator, Sacred Reich, and Stormtroopers of Death.

Good grindcore bands include Agathocles, Agoraphobic Nosebleed, Anal Cunt, Carcass, Cephalic Carnage, Napalm Death, Soilent Green,Nasum, Pig Destroyer, The Atomic Fireballs, Teen Cthulhu (may have trouble finding these, i can send the two to you if you need them), Bloodhag (I have two of these, also) ,and Yellow Machinegun.