I support the recommendation of Neal Stephenson for high technology sci-fi:
Snow Crash,The Diamond Age, Cryptonomicon
I often find myself thinking about these books throughout my day because of where we're going with technology.
I'm sure someone put William Gibson, but if not I adored Neuromancer. It's what I call passionate sci-fi - not exactly romance sci-fi, but there's something of that in it.
I also enjoyed Richard K. Morgan's series, starting with Altered Carbon. Very quick reads, with engrossing stories.
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