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Ewan McGregor:
It adds a different level when you realize he played a younger version of Billy Crudup's dad in Big Fish. Also, he's a damn fine actor, and can pull off the gravitas (and surprise heel turn) of Ozymandias while still looking the part.
Jude Law:
Ozymandias and the world of tomorrow? Why, yes. A sexy man like that could play a guy who's in great shape for being 40+, especially since he's only 36.
Morrissey:
Imagine the soundtrack with this one. "Please Please Please Let Me Get What I Want," "America Is Not the World," "Panic," "Ask" ("the bomb [squid] that will bring us together"), "That Joke Isn't Funny Anymore" (for the Comedian scene), "Some Girls Are Bigger Than Others"... a perfect fit.
Chuck Norris:
"You're a lone wolf, Ozymandias!" Admit it, that looks like a guy who not only did it 35 minutes ago, but will do it again if you're not careful. And he's probably the only man in Hollywood who could actually catch a bullet.