Burzum, definitely. Then if you like that check out Noenum and DRUDKH (seriously DRUDKH rulez!). And maybe also Nyktalgia and Interitus and Uruk-Hai. Also Ildjarn. (thanks to Astaroth!)
Then, get all the classics, starting with Ulver (you must get Nattens Madrigal and Bergtatt), then working to lesser bands like mayhem. For Mayhem Live in Leipzig is good, better than the De Mysteriis..... album. And of course get all the emperor albums.
For some epic, almost classical stuff, get some Taake, Mystic Forest, Wolves in the throne room, Nokturnal Mortum and Satyricon(not new satyricon!).
Ildjarn has some fucked up productions if thats what you like. Behemoth may also suit you, with a style near-ish to Darkthrone.
Bathory is viking metal, but still raw in terms of production and atmosphere. Windir and Falkenbach are also good viking stuff, as is Enslaved ad Vreid-(in terms of fast riffing style)
For raw and cold, very hateful stuff, check out the USBM acts like leviathan, xasthur, lurker of chalice, Krieg, Nachtmystium. All of these bar Krieg will deliver the slow doomy BM.
DO NOT get any dark funeral or gorgoroth or demon burger.
For very good stuff i cant be bothered to group up, go some Bekhira, Osculum Infame and Deathspell Omega NOW! (Thank you Eisenfaust and Husker for recommending those!)
And Velvet Cacoon is good stuff, not doomy or cold and hateful, all i can do is say its delirious and fucking mental. Get some!
And thank you to all the people on this site, who showed me almost all of those bands.
