You've probably already gotten this rec, but I'd just like to put in another good word for Ann Leckie. Her first two books, Ancillary Justice and Ancillary Sword, are great, solid military SF with some deep thinking about both culture and the psychological/human sequellae of technology.
Claire North also does some great literary SF in a modern setting; Touch tells the story of a ghost who can switch between bodies and suppress the native personality, and The First 15 Lives of Harry August is about a man in a world where some people are born with the ability to, when they die, be reborn in the same place and time as before with the memories of their life... which is now in the future. Some great parallel universe stuff in Harry August, and Touch is a fun spy thriller with a really unusual twist.
Re: CANON RECOMMENDATIONS
Claire North also does some great literary SF in a modern setting; Touch tells the story of a ghost who can switch between bodies and suppress the native personality, and The First 15 Lives of Harry August is about a man in a world where some people are born with the ability to, when they die, be reborn in the same place and time as before with the memories of their life... which is now in the future. Some great parallel universe stuff in Harry August, and Touch is a fun spy thriller with a really unusual twist.