I too love SF. My father has a small library with the SF classics and I made my way through it. It was the opening to new worlds, new ideas and big adventures. I loved the Foundation series, and all the Robot books, and the original Dune series. I found though, that RAH books were easier reading, more 'immersive' if that makes sense. While I loved each one, the book I most remember is Friday. He truly was a gifted writer.