Well I like Heretics and Chapterhosue better than God Emperor...
I liked them all, but ya, Chapterhouse and Heretics were great.
God, it'd been years since i've read the series. Even though i read a lot of teen sci-fi, like L'engle, Adams, and Monica Hughes, Dune was my first adult introduction to Sci-fi. I read them when i was 18 and then a dozen times since then. I think im about due for another read through.
Other then the first mini series i have never watched any Dune movies.