Just saw a good heist film I've always wanted to see:
The Friends of Eddie Coyle, (1973) starring Robert Mitchum, Peter Boyle, Richard Jordan, and Steven Keats as a character named Jackie Brown. Hmm.
A good film with Mitchum as a bank robber trying to avoid jail time in his older years by cooperating with police in a illegal gun sale sting, among other things. There's more to it than just a heist but there are several heists in the movie and it's overall excellent.
If it hasn't already been mentioned, there's
Heist to go along with the title of this thread. From 2001, it's got Gene Hackman, Danny DeVito, Sam Rockwall, and Rebecca Pidgeon. David Mament wrote and directed it, and per usual his films, has great dialogue and hard-edged characters, and a few twists that I'll have to see again to remember. It's been a while, but it's a fine movie.
EDIT: I see DexterRiley has already shown
Heist in a post, so that's two people recommending it. Go for it!