I really like most of what Mayhem has done. The first Burzum is great, classic period Darkthrone isn't exactly my thing but it has its moments. First Immortal is good. Dornenreich's Flammentriebe was a big positive surprise for me, and I like what else I've heard of them (although a lot of it is kinda more gothic metal or something). Obtained Enslavement's Witchcraft is pretty cool for sympho black, a bit riffier than the average. The first Fleurety and Ved Buens Ende's album are nice; I appreciate them more for what I perceive as the less black metal parts, but it's undoubtedly related and I like all the dissonant Voivody stuff on those.
Then there's all the first/first-and-a-half wave stuff, but none of that stuff has what bothers me about black metal (drum machines, extremely repetitive rhythms, riffs that seem to just cycle through the same few notes or chords, etc).
EDIT: Forgot Bethlehem's Dictius te necare, good album and I especially love the vocals. I need to listen to their Dark Metal album. Also, Drowned's Conquering the Azure demo, a lot of people seem to consider it death metal but it's clearly black metal to me.
Oh, Drottnar's Welterwerk too, although the average black metal purist wouldn't consider it one (it's basically black metal-influenced tech metal, sorta Mayhem's GDoW or Chimera taken a little further).