If you want a good Science Fiction I recommend Endless Blue by Wen Spencer. If you want Science Fiction with a large dose of Fantasy I recommend Tinker and Wolf Who Rules, also by Wen Spencer.
Oh. Jeffery A Carver. You will never look at the stars in the same way once you have read the Chaos Chronicles
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Also, it might be worth using the Fictionwise coupon to snag Science Fiction books from E-reads that might interest you.