Ha ha ha.....when I think of God Emperor, I think of Leto II in "God Emperor of Dune".
That was a good read.
I'm reading Heretics of Dune right now. I have all the stories up through Chapterhouse Dune, and I've heard that Dune 7 was completed by Frank Herbert's son, Brian, along with writing partner Kevin J. Anderson.
Also enjoyed "Dune: House Harkonnen", a one of the many prequel novels written by Brian and Kevin. A fast read, and very enjoyable, IMHO.