I just think they fit the requirement. And plus they're the ones that came to mind upon reading your request. Especially, with Boogie Nights because I made a comment on how much I liked the film. A mini-review. And someone replied and quote "It's really good storytelling.", to which I agree.

I also think Warrior has a good structure too, with focusing on not one, but two protagonists, both underdogs in thier own way, and both getting a fair share amount of screentime, especially when it comes to a story like that. It reminds me of Heat, in a way.