Surprised you haven't done more early 70s classics... if I had to pick one movie to take to a desert island, it might be this one. Jack Nicholson's finest hour, and one of THE GREAT movie endings. And while you're at it, how about McCabe & Mrs Miller? Beatty's finest hour, Altman's finest hour and one of THE GREAT movie endings.
Oh and can I put a word in for Safe? Finest hours of Julianne Moore & Todd Haynes, the best-ever Kubrick movie not made by Kubrick, and one of THE GREAT movie endings.