Chasm City could be amazing on the big screen - if it were done right.

Also, I'd like to see at least a few of J.G. Ballard's short stories (The Concentration City, The Voices of Time, The Cloud Sculptors of Coral D and the other Vermillion Sands stuff, for example) translated into Twilight Zone or Outer Limits episodes. Ballard is great at creating a sort of surreal atmosphere, especially in the Vermillion Sands stories.