If you go by directors, rather than titles, I recommend Jim Jarmusch, Mike Leigh (secrets/lies, etc...the acting in all his films is simply superb), John Sayles (a hard to find early one of his, Brother from Another Planet, is worth the hunt).

And one of my favorite just plain funny movies is Tapeheads, w/a very young Tim Robbins and John Cusack ("You've tried the best, now try the rest!"). John Cusack was very good as an unlikely assassin in a movie called Grosspoint something or other...I like his sister too