scarface is trash. the worst of 80's filmmaking. the untouchables also has some 80's feel, but in a great way. i love that movie.
i don't know what constitutes a "gangster movie" and what doesn't, but there's a line in pulp fiction (paraphrasing) when jules is talking about jimmy's wife who's gonna come home and see in her kitchen "a bunch of gangsters doing a bunch of gangster shit". i don't really consider pulp fiction to be a gangster movie, but that phrase is how i've described snatch, which is a great fucking gangster movie. in fact, i saw it last friday at the new beverly (the old theater that tarantino bought and renovated across the street from el coyote, where sharon tate had her last meal).
i've seen it probably 30x but rarely start to finish, and it holds up.
road to perdition, while also possibly not a true "gangster movie", has a much more honest depiction of frank nitti, but i can still enjoy the cartoon character from the untouchables. i watch road to perdition whenever it's on. i'm not sure you can get a better cast than hanks, newman, jude law, daniel craig, stanley tucci. the cinematography and music is also insane. capone was supposed to be a character with 1-2 scenes, but they cut them. smart move.
godfather movies
goodfellas
snatch
road to perdition
a bronx tale
i also have a soft spot in my heart for barry levinson's bugsy. huge cast, great performances from beatty and bening. often overlooked film. and harvey keitel is hilarious in it.