Anyone know some really good, mind-bending sci-fi?

I'm wanting to read some sci-fi books and was wondering if anyone had any suggestions of really interesting and mind-bending/thought-provoking sci-fi. I'm reading Stranger in a Strange Land right now and have read 2 Philip K. Dick books. I like them pretty well and want more like this. So far, on my kindle... show more I'm wanting to read some sci-fi books and was wondering if anyone had any suggestions of really interesting and mind-bending/thought-provoking sci-fi. I'm reading Stranger in a Strange Land right now and have read 2 Philip K. Dick books. I like them pretty well and want more like this. So far, on my kindle I have gotten the following (please suggest things other than what's on this list):
Childhood's End by Arthur C. Clarke
Starship Troopers by Robert A. Heinlein
The Ender's Game and Ender's Shadow Quartets by Orson Scott Card
Foundation by Issac Asimov
Space Odyssey Series by Arthur C. Clarke
The Mote in God's Eye by Larry Niven & Jerry Pournelle
Dune by Frank Herbert
The Forever War by Joe Haldeman
Hyperion by Dan Simmons
Update: I actually already have Neuromancer on my Kindle too, so good suggestion.
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