Children of Time is a must read. I also like Children of Ruin even though it was dangerously close to a rehash. Children of Memory was good too but really stretched the premise. I liked it in spite of getting very close to space opera with the built up cast.
I'd also recommend Diaspora. It's about post humanism where humans have split into a few factions: fleshers genetically manipulate the human form, gleisners are human consciousness uploaded into robots, and citizens who are uploaded (or generated) consciousness without a physical form.