Dissection are one of my favorite bands; and if you held a gun to my head and said I couyld, and HAD to pick only one favorite band, they just might probably be it. Check out ANY dissection album; Storm of the Lights Bane and The Somberlain are both incredible.
For other black metal, Marduk are in the more brutal vein for later stuff; more black at the start of their career. Darkthrone are also a classic: A Blaze in the Northern Sky is a true classic album that any fan into black metal should hear, and one of my personaly top 5. Any Emperor is good; but the old stuff like Wrath of the Tyrant or In The Nightside Eclipse are my personal favorites. Gorgoroth are an excellent, more old school sounding band; my favorite from them being Under The Sign of Hell. For UBER raw, Beherit from Finland; they are VERY low prodctuon and wicked sounding.
ALso out of Finland are Sargeist(their 2003 album Satanic Black Devotion was one of my favorites that year), who consists of members of Horna, Behexen and Satanic Warmaster(also some good Finnish black metal). You also might want to try out The Black(Sweden), hard to find but has Jon Nodtveidt of Dissection in it. Ophthalamia, who is the brainchild of It of Abruptum, is almost old school doomy black metal. Even sabbathy at times.
As for some death metal, Benediction is some great old school death metal; as is Pungent Stench(almost cock rock death metal, if that makes sense.) Gorefest(Erase and False) are some good old school stuff, and Vital Remains is always a good listen(their last album, Dechristianize, was really good.) Jungle Rot have an old school sound, and for some technical death, try out Decapitated, Yattering(both from Poland), Necrophagist(Germany, and their guitarist/vocalist is astounding), and if you are in the mood for some more melodic black metal, Anorexia Nervosa of France might gain your interest.
hope i gave you some info there.