I could see Caviezel. He has the requisite sense of intellect, emotional intensity and remoteness. He also has the sophistication to be a believable Bruce Wayne which is the key to a good Batman, IMHO. I could also see a relative unknown as a good choice, provided he's a good fit.
However, I think the best idea really is to let the whole franchise lie fallow for a bit. Way too soon to reboot the reboot, IMO.