Third man is certainly good. My wife and I make a slight effort to watch Orson Welles movies that we'd never seen, and I can say that I also enjoyed "Touch of Evil" which was the first movie of his 2nd career in Hollywood. He fell out with the studio and I get the impression they removed some of the gimmicks that he wanted in it, but it's very good. I started watching "the magnificent ambersons" but it's pretty slow and I haven't quite made it through that one.
For car guys here is something sort of interesting: "The Young In Heart", Selznick picture, not a dark picture. This is the picture where the grandad in a family of con artists gets a job selling cars and the dealer sells phantom corsairs. It has some hilarious car salesman talk in it and of course the car is fabulous. They sped up the film so that test drives are like 150 mph on little french farm roads. That is not the main plot. The main plot is of course the main characters fall in love and all that regular stuff.