Ibarraa,
Have you read the sequels to Frank Herbert's Dune?
If not, and you seem to have enjoyed Dune, I highly recommend the five remaining books of the Dune Chronicles.
My favorite being Dune Messiah.
A friend of mine Carlos Orehuela is a professor of Spanish literature. In our discussions about Spanish Literature, I have always been intrigued, saddened, and dissatisfied knowing there is a whole sphere of literature that has (unfortunately) been largely ignored by American Universities, because they haven't seen fit to have them translated into English. When I was completing my Spanish requirements toward my Bachelors Degree at the Universidad de Guadalajara's CEPE (Spanish immersion), I was exposed to several Spanish Language movies based on serious Spanish Literature. Fortunately, a few did have English subtitles and I was able to follow the dialog more closely. I did find them to be immensely emotive emotionally and expressing ideas on par with Homer, Sophocles and Michele de Montange.
I will call Carlos and see if he knows of an English version of La Puerta Oscura (The Dark Door).