Dune lovers, please help.

I am a teen who loves Dune, and i mean LOVES Dune, read all 6 (we don't talk about the others), and i need help. I've read Asimov, Hienlein, the classics (trying to read William Gibson but my library is taking forever). I need some books to read, new books are too fast. I like the slow burn and quite often philosophical nature of the old sci fi books, please help me. New books are fine, but give me some with the same feel.