For me, it's The Dark Knight. Heath's Joker was amazing, yes. But everything else clicked as well.
And I feel Nolan and Bale nailed it with Bruce Wayne/Batman. Not just Bale's performance, but the way Nolan made sure we saw Wayne plenty aswell, being Wayne. The older movies focus and Wayne as Batman, while the Nolan-movies focus on Wayne as Wayne. Like Alfred said, you can't just be a billionaire and not act like the billionaire playboy. Appearing at the restaurant with a famous ballet-dancer, and just shoving some tables together because he owns the place. Appearing at Dent's fundraising with not one, but three pretty women. Stuff like that.