Since you're into sci-fi, I recommend the Mars trilogy by Kim Stanley Robinson. Cool science and interesting looks at philosophy and politics.
If you haven't checked out Ender's Game and Speaker for the Dead, then they are a must for any sci-fi reader.
Definitely Ender's Game, but you can't leave out Ender's Shadow, which is basically the same story, told by Bean, Ender's buddy.
Other Sci-Fi authors I really enjoy are James Alan Gardner (Expendable and others), David Brin (The Postman, Uplift Wars series) and Larry Niven & Jerry Pournelle combo. The latter pair has some really interesting reads with Inferno, Footfall, Lucifer's Hammer, The Mote in Gods Eye, The Legacy of Heorot, as wells as the sequels.
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