I have read all the Foundation series, and youīre right, the first trilogy is the best. I donīt think those are depressing at all, but i havenīt read the robot series, so i donīt know.
As for Dune...is highly recommendable and the 2nd and the 3rd books too, but then it goes downhill, even though it is still very good. More scifi, i recommend "ring world", "solaris" and "do androids dream with electrical sheep?"
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