[quote:post_uid0="Freak"](The Dude, I know you're good for at least a few here).[/quote:post_uid0]
Nice to know that. ;)
Hmmm...this is kind of tough. I don't know if you've seen American Beauty, but that is a wonderful movie. Great acting, a wonderful/sad story. I don't know if you've seen it or not, but that's a definite must see.
There's Scarface. If you like movies like the Godfather, you should like this.
Ditto for Goodfellas and Casino (but being a fan of the Godfather movies, I'm sure you've already seen em ;) ).
A couple other recommendations would be Vanilla Sky and Requiem for a Dream. Both are really kind of weird, but they have some great acting (especially Ellen Burstyn in Requiem).
Pick up any Stanley Kubrick movie. Personal recommendations would be A Clockwork Orange (another weird movie

), The Shining, 2001 (although not too much acting involved, it is a visually entertaining film), and Full Metal Jacket.
Almost any Jack Nicholson film, as well (As Good as It Gets, and for the comedy side, Anger Management or Easy Rider for the druggie/comedy/drama).
That's all I can think of right now.

Hope I was able to help.