Here’s my picks:
The Survivors aka Prison Planet, by Tom Godwin: Neat little sci-fi novel from the 1950s about human survivors stranded on an incredibly hostile world by an enemy alien race known as the Gern. The clever twist on the standard “desert isle” story is that the story plays out over centuries, and dozens of generations. Not a real deep novel, but a good, fun read.
Press Enter, by John Varley: A 1985 novella something along the lines of Skynet in the Terminator (only without the Terminator). Some of the computer concepts in the story are a little dated, but it is still a top flight, and chilling bit of cyberparanoia.
The Kedigern Chronicles, by John Morressy: Light-hearted, clever, and often hilarious take on the fantasy genre.
Here’s a non-obscure Godwin: “The Cold Equations”.
I liked The Survivors a lot.
Sounds like fun, I'll have to look for it.