I am a big fan of Philip Dick. The books like "Do Androids Dream of Electric Sheep?", "Ubik", "Martian Time Slip", "The Three Stigmata of Palmer Eldrich", and the best one "The Man in the High Castle" should be readen by my opinion. I also like Stanislav Lem, but I am not shore if any of his books besides "Solaris" are translated and can be found.
This is more of phylosophic science fiction. If you are looking more for action try Mike Crichton - The unforgetable writer of "Jurrasic Park" - every time I saw one of his books I bought it and he never dissapointed me.
If you are looking for fantasy - try unfinished Robert Jordan's "Wheel of Time".