The Guardian lists the top 20 geek novels. I’ve read all but four three:
Watchmen — Alan Moore & Dave Gibbons— can’t remember when I read this but it was about when the movie came out.- Stranger in a Strange Land — Robert Heinlein
- The Illuminatus! Trilogy — Robert Shea & Robert Anton Wilson
- Trouble with Lichen - John Wyndham
Can’t say I’ve read all of Brave New World either.
Of the rest, I find it nice to see Bank’s Consider Phlebas on the list, although of course Use of Weapons is much better.