As for Dune, the movies good but I love the books. All of them. Frank Herbert wrote the main series of books and his son finished it off a couple years ago using his fathers notes. His son has also written prequels to the dune books. 3 based around the 3 main houses and then further back again with a series called the Butlarian Jihad. Depending on how fast you read you have a winters worth of material right there.
As for Sharp, I haven't watched the tv series but I have read all the books. Bloody fantastic they are too.