We're getting into the 1930s now - the sound era and the start of the Golden Age. Here's some recommendations.
The Divorcee - Norma Shearer won best actress for this performance of a sophisticated woman. She evens the score after her husband has a brief affair, and as this is pre-Hays code, she isn't punished for it.
Hell's Angels - produced by Howard Hughes, is worth watching for the dogfighting stunts alone. 4 people died filming them.
Holiday - Inferior to the later Hepburn/Grant remake, but still a solid rendition of the play.
L'age d'Or - Luis Buñuel's surrealist showcase
Animal Crackers - the Marx brothers, it's still funny