Jackie, go see Get Shorty right away!
FlyingBIZKIT, Heat is definitely most awesome. It's long, but I like how we see a lot of the backstory on all of the major characters and how their professional lives affect their personal lives, instead of being your typical suspense/action flick where that kind of stuff is glossed over. Great storytelling, and as a big De Niro fan, I can honestly say that this is one of my favorite 3-4 movies of his, along with Goodfellas, Godfather II and maybe Jackie Brown (where he has a supporting role, as opposed to a lead).
Before anybody asks, Taxi Driver and Raging Bull I tend to put in the "Phenomenal performance in a good, but not great, film" category.