Another of my "Ten Best SF" lists would be:
Hyperion, Dan Simmons.
Left Hand of Darkness, Ursula K LeGuin
Speaker for the Dead, Orson Scott Card
Downbelow Station, C J Cherryh
Tau Zero, Poul Anderson
Gateway, Fred Pohl
Earth, David Brin
Slow River, Nicola Griffith
Childhood's End, Arthur C Clarke
Warning: My choices will vary at random intervals, depending on my daily mood. Some of the books are in series; just because I like one of them doesn't mean I like them all. For example, I did not like most of the Ender books.