Anyway, onto the topic of this post: My new major inspiration for the Grand Universe is Philip K. Dick's Do Androids Dream of Electric Sheep?
I mean, this book is awesome. Near-human androids working on the colonies, trying to escape back to Earth, where they are hunted down by bounty hunters working for the police. The Rosen corporation trying to keep the androids alive, and, while this is going on, a fake police department set up by escaped androids, as well as the post-apocalyptic setting, with the mainly empty cities, and the almost complete lack of non-human life left on Earth.
So yeah, this book is definitely added to major sources of inspiration.