Less Than Zero, Chaplin, US Marshalls, Wonder Boys, Kiss Kiss Bang Bang, Good Night and Good Luck, Iron Man, Tropic Thunder, Sherlock Holmes.
All before Oppenheimer. His catalog is really underrated because most people associate him with being the coolest movie superhero and the catalyst that allowed Disney to print money hand over fist on a daily basis.
Less Than Zero was really not a good movie, but his performance made it and then proved to be prophetic. Guy had a pretty ridiculous childhood too.