(Reviving this thread)
Jon Hamm would be absolutely perfect on every level for Superman. The humor and humanity of Clark, and the confidence and intelligence of superman, Hamm can pull it all off.
Manganiello looks more intimidating than Hamm but Superman never came off to me as an ominous, big-meathead (sorry Joe fans) but aside from that, I dont believe hes even half the actor that Hamm is.
I'd rather have Routh than Manganiello for the reboot,... poor Routh.