Vito,
If you like the scope and scale of Dune, make sure you also check out Alastair Reynolds. He has a series of novels (Revelation Space, Redemption Ark, Absolution Gap and the stand alone Chasm City) which have a very intricate and detailed history developed to support the stories themselves, the interplay of many separate factions of humanity, and the large scale of the novels in terms of galactic space and time covered. They are rich in details and written well, so that they go down quite smoothly, like a good Scotch
There are lots of other series that can be recommended, but Reynolds is relatively new and comes to my mind first right now.
Your assignment is to read Revelation Space before Powerfest and then tell me what you think! (Unless you've already read it.)
Also, which came first - your reading of Dune, or your first exposure of To Tame A Land off Piece of Mind??
Ken