Edit: if you haven't read anything from Alice Sheldon (a.k.a. James Tiptree Junior, a.k.a. Raccoona Sheldon) I wholeheartedly recommend you chase down anything of hers and read it. It is not an accident that she is first in my list because she is, for me, one of the absolute best SF authors of all time. Same for Cordwainer Smith. It is distressing to see their names having faded into obscurity, with modern readers.