I'm a big Henry Miller fan, I think his writing is important to American literature.
I like the Sexus/Plexus/Nexus trilogy better than the two Tropics.
I really like two posthumous releases, Moloch, and Crazy Cock.
I'm also a big fan of less "fictional" more "opinionated" works like The Books in my Life, The Colossus of Marousi, and The Air Conditioned Nigthtmare.