for dune, you gotta read the starting 3 which is the most relevant i guess. after which it kinda dies off.

philip k dic's short stories are very good. The short stories in which comes with minority report is really good. he has this very good sense of the time continuity. I haven't touched that book for ages.

i think critchton has great ideas but not a great writer. his movies some how surpass his books. which is usually the other way around generally.