Different Seasons is the only one of his short story books I haven't read, I think. My favourite two collections of his are Everything's Eventual and Full Dark, No Stars; however, my favourite story came out of Skeleton Crew, "Word Processor of the Gods."
And just saying: I read the book, I saw the movie, "Secret Window" the movie is better than "Secret Window, Secret Garden" the story. (And I so rarely say that.)