Lately I've really got into Van Der Graaf Generator. Apparently many prog rock fans don't like them, and although I'm no prog rock expert, they do have a different (often darker) atmosphere than pretty much all other bands I know. I'm currently listening to their Godbluff album, which is insanely good. My other favourite by them is The Least We Can Do Is Wave To Each Other, but almost all of their "classic" albums are excellent. Will listen to their post-reunion albums soon, and then Peter Hammill's solo albums as well (there should be real gems there too from what I know).