Your top 5 sci-fi novels?

Been reading a lot of sci-fi lately, and I was just wondering if I could have some recommendations. =)

I am currently reading the Hitchhiker's Guide to the Galaxy series, and after that I'm going to read 2001: A Space Odyssey.

Thanks! <3
Update: (((((((Cinn))))))) Lol, figures that you would come and pervert my serious question! <33
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