I'm just about done reading everything Dune including the prequels and I gotta say I am really struggling to finish for one reason: it's the absolute best series I have ever read and I don't want it to end. The first six especially were extraordinary and I didn't really like Brian's writing style for the last three but IMO he picked up his game doing the The Butlerian Jihad and I'm looking forward to the other series.
What can you recommend knowing my love for Dune? It doesn't necessarily need to be fantasy or sci-fi but it needs to be complex and the characters deep.