I want to give more props to Heat and Heist. Mamet's writing is great, as is Hackman in the later film. Heat gives you Michael Mann's visuals and the only DeNiro/Pacino on screen scene ever.
I will also throw in Out of Sight. This is my favroite Sonderbergh film. Very good George Cloony, nice ties to Jackie Brown, J-Lo looks good and holds her own (although I still haven't figured out how a cop affords Dolce and Gabana suits), and a neat cameo at the end.