Check out Mayhemic Truth too, of course. And then buy all of their albums. My personal favorites are Mayhemic Truth's "In Memoriam" and Morrigan's "Plague, Waste, And Death," "Headcult," and, most controversially I'm sure, "Welcome To Samhain." "Welcome To Samhain" I'm sure is on the bottom of most people's lists, but I like it quite a bit. "Plague..." is almost entirely pure Under The Sign/Blood Fire Death worship, and Headcult is pure Hammerheart worship, but still maintaining the harsh vocals.