I like anything that sounds good (it's a terrible response, I know)! Some of the best black metal bands IMO would be Dimmu Borgir, Cradle of Filth, Darkthrone, Watain, Witchery, Enslaved (not sure if they are really black metal any more per se), Dark Funeral, and Emperor (though I'm sure I've forgotten many others that I like).
EDIT: Can't believe I forgot Immortal! Sons of Northern Darkness was like the only album I listened to when it came out.