Ask HN: What should I read next?

(This is a selfish ask, but I posted it thinking it might help others too)

A few months ago, I started reading Isaac Asimov's "Foundation" and fell in love with it. I went on read the rest of books in the Foundation Series. Sidenote: The books get progressively worse and the last one is a drag. Anyway, the reading was a good break from my startup in 2 ways: (1) I wasn't in front of yet another screen (tv, browsing, movies), and (2) It was, in some way, intellectually stimulating. It made me think.

So, fair HN, can you suggest what should I read next? Preferably fiction (I feel most non-fiction is worth a blog post). Something that fits a short attention span. Something a geek would like (I've already read "hitchhikers guide to the galaxy").

"The Diamond Age" or anything else by Neal Stephenson.

Thanks! Am (already) beginning to read it

RiderOfGiraffes also suggested Snow Crash; both would be excellent choices. I'd add to this Cryptonomicon, which is an interesting story, interesting thematic matter (relevant to software folks, and presented intelligently), and just full of different ways of looking at things (the scene that describes the Hindenburg disaster, or eating Captain Crunch cereal, were both perfectly clear, yet told in ways that took me some time to sync with what they were actually referring to.

Also consider most anything from Vernor Vinge. Some of my favorites from him are A Deepness in the Sky, Rainbows End, and A Fire Upon the Deep. Since he's a Comp Sci professor, he handles technology issues (and especially computer-related stuff) very realistically.

And if you're looking back into the classics, consider Larry Niven's "Known Space" books, particularly Ringworld.

"Anathem" by Neal Stephenson is the best book I've read in years. The first 50 pages or so are a slog, but after that I couldn't put it down.

"What is the What" by Dave Eggers is also phenomenal.