[Rummyfan]

Layer Cake
Heist (Gene Hackman)
Spartan (Val Kilmer)

My benchmark for a good flick is that if you stumble across it being broadcast - or on cable, however you want to say it - you watch it no matter how many times you've seen it. All three of these fall into that category for me.

[Kickaha]

By that criteria I would add The Duelists, an early Ridley Scott effort. Keith Carradine and Harvey Keitel in several intense Napoleonic era sword fights.