EXACTLY. Phoenix would be perfect those versions of the Lex Luthor character, there is no one better.
Actually, in my novel, which I wrote with Phoenix in mind for Lex, I take the MOS approach and the Presidency storyline, with Lex funding terrorism to make the President look weak, only so he can turn around, win Presidency, and wipe out all of the enemies of the United States and become the most powerful man on the planet. And this coincides with the debut of a certain super powered boyscout who is determined to hope to a world that's lost it's way.
As I said in another thread, my take on Superman will debut in novel format in the communtiy board after Returns comes out. Very real world, very character driven, but I also throw John Corben/Metallo in there as Luthors " Ultimate Weapon ".