The original cut of Dune was extremely long and Lynch said that he did not want his name on any cut shorter than three hours as it would not be a true representation of his work, sadly A none listened to him and B the longest cut available is 2 and a half hours or so, however generally go for the longest version of the film you can find.
Basically if you are going to read the sequels then I recommend going for Dune Messiah and Children of Dune first, they continues the saga, with the same characters. God Emperor of Dune follows them but are set long after everyone save Paul's son is dead, the rest of the books in the series get a little weird, still good but weird. However the first two or three sequels those I fully recommend.
__________________
@}->-If you are ever attacked by vampires, held hostage by aliens, haunted by angry ghosts, put on a zombie's menu, stalked by an undying killer or in other ways find yourself in a horror movie situation, never, ever go near the bathroom!-<-{@
|