*shrug* Those are probably the two biggest villains in Superman mythos. Certainly the two that the mainstream film audience is most familiar with. Mind you, I'm not arguing.Why all the fucking Zod? I know Luthor's been done to death in the movies (though never in the awesome Clancy Brown way) but Superman has tons of actual interesting villains. Do we need to retread past movies so closely in reboots? At least Spider-Man's reboot is giving us a villain we've never seen on film.
Personally, I'd love to see Braniac, Bizarro or Metallo.
Bizarro could be like a full-length version of the only good part of Superman III (where he fights himself). Treat it like a horror movie or something. Although, Bizarro being a clone, you'd probably have to have some kind of motivating force that clones him. Which likely means Luthor. At least then, he'd be more a secondary character.
Braniac? Alien invasion movie, done with a superhero twist. Nuff said.
Metallo, I'm not sure if you could get a full movie out of him. I've always felt he would make a great bodyguard for Luthor (I know, I keep bringing him up. Luthor just fits perfectly with the Superman mythos. There's a reason he keeps popping up in different mediums).