I've seen this concept used by some bloggers and always thought it was a really great way to broaden one's movie-watching horizons. Each choice, where I've seen enough to have one, is my favourite film from that particular country. Obviously funding comes from a variety of places with most productions, so I've tried to make every choice a film that is particular to the respective country in some way, be it in setting, characters, or themes.
Please suggest countries and films not on the list, and hopefully with your help I can arrive at 80 in no time. It would be great if the list could stand as a catalogue of greats once it's completed, so where I don't consider a particular pick great I'll note it in the list view and welcome you to suggest something better for that country.