Debate of the Day: What’s Your Favorite Sci-fi Book?

So I’ve got one of those new fancy Kindle Fires, and over the past few weeks I’ve been trying to scarf down a number of classic sci-fi books, so they might aid me in crafting my OWN sci-fi book which is nearing completion. I’ve gone through a lot of classics, but I figured I’d crowdsource suggestions that I absolutely must read.

So far in the past month or so, I’ve gone through

Ender’s Game

The Road

The Stand

Never Let Me Go

The  Hunger Games Trilogy

The Forever War

Neuromancer (well, almost)

It’s a mix of soft and hard sci-fi, but I found Neuromancer almost too tech-heavy to get through. Perhaps that makes me a sci-fi pansy, but so be it. Anyway, I’m looking for a few of YOUR favorites that I can download and read. Feel free to list some, and a sentence or two describing them would be helpful as well. I look forward to reading your suggestions!