Dunno whether O Brother Where Art Thou is your thing, but I like it.

Have you seen (and if so, do you like) The Usual Suspects? Or L.A. Confidential?? Or Pulp Fiction?

Lola Rennt/Run Lola Run
Butch Cassidy and the Sundance Kid
The Sting (Not sure which version to recommend - I've only seen one. The plot was re-used in one of the episodes of Hustle season 1 or 2, which rather gives away the ending if you've seen it)

I wasn't mad keen on Unbreakable, personally.