I'm a big reader. I agree with Devgil in the choices. And would add John Ringo, David Drake and Doc Taylor, yeah, he's a real rocket scientist, works for NASA kind, not sarcastic. I also recommend Larry Niven's Ringworld series. ANd C.J. Cherryh's Foreigner series.
Ooh, John Varley! I was watching C-Span and they were interviewing Tom Clancy, and Clancy called John Varley the best writer in America, of any genre. SO I picked up his Titan/Wizard/Demon trilogy. Wow! Been hooked ever since. Also love his Golden Globe novel.
Eric Idle of Monty Python wrote a sci-fi novel. I think it's great. I also learned more about the inner workings of comedy than I would have thought possible. THe novel also seems as if it would fit into John Varley's universe.
Just finished David Weber's Mission of Honor. Now what am I going to do the rest of the month? lol It stands alone, and mostly refers to the two previous novels, so a new reader should not have great difficulties in becoming absorbed in the story.