[Oni]

I'd recommend The Godfather 1-3. Read Puzo's works as well.

Scarface, Reservoir Dogs, and Pulp Fiction other good ones on my list.

I've actually not seen Scarface or Reservoir Dogs. Reckon either would be a good movie club recommendation for my colleagues too?

Depends on how old your coworkers are. I'm sure some could see the movies as off-color, though they're classics.