Okay, This is not exactly my favorite genre, as I tend to lean more towards comedies, action, sci-fi and fantasy. I will do this because I said I would (here you go, 5020). Some of my picks I haven't seen in a while, so I will forgo my usual quotes this time.

(Again, in no particular order)

 #1. Millers Crossing

 #2. Scarface

 #3. Goodfellas

 #4. Casino

 #5. Heat

 #6. Carlito's Way

 #7. American Me

 #8. Colors

 #9. New Jack City

#10. Road to Perdition

#11. Gangs of New York

#12. Layer Cake

#13. Johnny Dangerously

#14. Romper Stomper

#15. Big Money Hu$tlas

I didn't put the Godfather's because I haven't seen them. I'll probably do a "Heist movie" thread later on down the road, so movies like the "Ocean's 11/12/13", "Dead Presidents", ETC should qualify for that one.

Discuss, and have fun! :)