James Caviezel
Matt Bomer
Eric Bana
...Of course he could play Lex Luthor instead but he'd make a good Supes.
Henry Cavill
ALL OF THESE GUYS FIT THE ROLE, AND THEY'RE BETTER ACTORS THAN BRANDON ROUTH.
BONUS:
Tom Welling
...With some [Correction: some SERIOUS] acting lessons he'd be perfect.
Now onto the the rest of the cast [Just throwing some new suggestions out there]:
Olivia Wilde as Lois Lane
Michael Angarano OR Seth Green as Jimmy Olsen
Alec Baldwin as Perry White
Paul Bettany OR Mark Strong as Lex Luthor
Idris Elba as Brainiac
...He's very versatile.
Adam Baldwin as Corben/Metallo
Chris Meloni as Parasite
Karl Urban as General ZOD