Deadmarye: Dune it is then. I wasn't aware of his son continuation (discovering the licence), so that's great, thanks !
Caesar.: Not everybody is fond of his son's books... I haven't read them myself so I can't give an opinion.
Tried the first one when they published it. It did not fail to entertain, but just that. It did not feel like a Frank Herbert's book.
Actually some of the themes of Dune can be found in The Godmakers, The Dragon in the Sea or the WorShip novels (the second of them having inspired Sid Meier's Alpha Centauri to a great extent.
All of those were better reads than the first book by his son and the other cowriter.
By the way, remember the entry on the unofficial Dune Enciclopaedia on the Butlerian Jihad? They took that explanation, instead of it being named after Samuel Butler, the writer of Erewhon. 'Nuff said.
That said, it has its followers, as it is known.