Great collection of short stories: Ted Chiang - Stories of Your Life and Others
Discussion
Ursula K Le Guin - Left Hand of Darkness (different, but great, especially for reading aloud to someone else)
Neal Asher - Weaponized (recent military scifi I enjoyed a lot, quick paced but not too dumb)
Three military scifi classics: Forever war by Joe Haldeman, Ender‘s Game by Orson Scott Card and Old Man’s War by John Scalzi.
Richard Morgan - Altered Carbon + Market Forces
I hate to say it but I'd swap out forever war and insert Stainless Steel Rat or maybe Starship troopers
Have to agree on forever war, it carries weight because the author was a Vietnam vet, but Oldman's War was a fantastic