Suggestions from us, Arthur C. Clarke's 2001 trilogies (there was a fourth entitled 3001 but not so good as the originals), Harry Harrison's Stainless Steel Rat series and the much underrated Eden trilogy (this should appeal to you if you enjoyed Dune).
3001 was OK. If anything, it did bring closure to the whole series. Out of the whole series I enjoyed 2063 the most.