The 1980 film The Lathe of Heaven is wonderfully done, especially when you consider it was made as a PBS project for $250,000.
Lathe of Heaven can be seen on youtube here: [1]
Those who haven't seen it should be prepared for a very low-budget film which definitely feels like a 1980 period piece, but I personally enjoyed it anyway.. and conceptually it's way better than a lot of much higher budget, newer movies.
It's for people who prefer to watch something that makes them think, instead of the usual scifi fare of effects, explosions, fights, and people running around in skin-tight outfits.
Outside of the Hainish Cycle The Lathe of Heaven is also worth checking out.