Director: (other than singer) Robert Zemikis
Superman/Clark Kent/Kal El: Brandon Routh (i think he aces).
Lois Lane: Rachael McAdams
Lex Luthur: Kevin Spacey (He can do the lex everyone REALLY wants)
Composer: John Williams
I know, two of the cast did SR, but they where very good, and i'd keep Routh and Spacey.
About the film, i would keep alot of elements from the Donner films. I really enjoyed the interpratation of Krypton and the Kryptonians. Regarding Krypton, I would keep the look of the Donner films, but, really expand on it. Make HUGE cities. Make the world look like a giant crytal.
The Superman score, i don't think, can be touched. It just seems synonomous with Superman, and is, possibly, the greatest main theme to any character in history.
However, note, this is not a criticism of SR. Just an alternate. But, some of my choices just seem plain the same, really