The Quiet Earth is fantastic -- the kind of movie that you used to find under a layer of dust in the back of your corner video store, rent on a whim, and then spend the next 20 years of your life forcing friends and relatives to watch.
Er, I mean "I", not "you". Because dear god did I do that.
It had a good DVD release about 5 or 6 years ago, but sadly never got a proper R1 blu-ray. If it's actually getting a theatrical re-release, you should drop everything and go see it.
Also, the novel it's based on finally
a few years back. It's fairly different from the movie, but definitely worth the $10.