You've got a lot of material to potentially choose from, so why not let the students make their own choices? Besides, it makes reading 30 "original" responses that much more interesting when they're not all saying the exact same thing.
Some of my choices would include:
Gibson's All Tomorrow's Parties (actually the whole trilogy would be okay here)
Neal Stephenson's Snow Crash
Neal Stephenson's The Diamond Age
Neal Stephenson's Anathem (for the really brave students...)
Orson Scott Card's Ender's Game and probably Ender's Shadow too
Orson Scott Card's Pastwatch
Tad William's Otherland series, although this is probably too bulky to be feasible
Daniel Keys Moran's Long Run and The Last Dancer
Heinlein's Moon is a Harsh Mistress
Heinlein's Starship Troopers
Heinlein's Door into Summer
If you open up your page limit the options are almost endless. If you don't, you'll never find a single work under 200 pages that illustrates the things you want to illustrate. Especially not in fiction.