How could you forget Goodfellas and Tombstone????
In an unguarded moment or two, and perhaps with the assistance of ethanol-based libation, I might tell you of my personal experiences with real characters who drifted through my life back when I lived in New York. They were rather well "connected", if you get my drift.
You also mentioned Tombstone which I've only seen once. Pretty good flick as well. I was considering The Quick and the Dead, starring Sharon Stone, but only because I thought she was hotter than a magnesium flare.