all of that stuff sounds pretty good guys
and i know of asimov - he invented the 3 laws didn't he
GOOD IDEA TOO
i personally quite like philip k dick - do androids dream of electric sheep is an absolutely superb novel, short but so much going on in there, everything a comment on the validity and identity of life, reality, individuality, love, sentience etc.
strangely i've never seen blade runner though
i believe he also wrote the novel total recall was based on
if you're into time travel as an SF device and a platform for things it can be used to represent, such as connection, consequence, fate and chance etc. i recommend audrey niffenegger's time traveler's wife
the movie from others i know who loved the excellent novel who saw it is a massive let down and a naff generic romcom bastardisation of it
but the novel i can assure you is outstanding, a great study of human relationships and the nature of fate and choice