Supergamera
Mongoose
Red/Green/Blue Mars - brought me back in "Hard" Sci-fi after a long time away
Neuromancer/Count Zero/Mona Lisa Overdrive - my gateway into cyberpunk.
Diaspora (Greg Egan) - probably not everyone's favorite, but one of the few books I've read multiple times, and the best transhuman book I've read.
The alternates:
Niven's Known Space books - can't limit it to one book, though, and the quality does vary. Great setting.
Diamond Age - this could easily replace the Gibson books on the list.
Culture series - still reading this, but pretty impressed so far.
Does alternate history count as sci-fi? Difference Engine, Man in the High Castle, and Guns of the South are all great.
Neuromancer/Count Zero/Mona Lisa Overdrive - my gateway into cyberpunk.
Diaspora (Greg Egan) - probably not everyone's favorite, but one of the few books I've read multiple times, and the best transhuman book I've read.
The alternates:
Niven's Known Space books - can't limit it to one book, though, and the quality does vary. Great setting.
Diamond Age - this could easily replace the Gibson books on the list.
Culture series - still reading this, but pretty impressed so far.
Does alternate history count as sci-fi? Difference Engine, Man in the High Castle, and Guns of the South are all great.