By the way, as long as we're talking about great SciFi stories (sometimes screwed up by Hollywood,) here's a link to Supertoys Last All Summer Long in pdf format. It's the short story Stephen Spielberg screwed up making A.I.
Blade Runner is one of the greatest movies of all time (not just sci-fi). I highly recommend seeing this movie. You will not be disappointed.
I honestly think Bladerunner was better than the original story. I read the novel shortly after seeing the movie and found it just too dreary and depressing.
Total Recall started off intriguing and funny, but because Paul Verhoeven was directing it, it was turned into a gratuitous gore-fest.