I know this would never happen but using their skills and power for their respective weights who would win in theory? I would say it would be very similar to the Khan v Maidana fight with Khan's speed too much for Froch early on. But as the fight went on Froch's strength and stamina would come through and Froch could possibly stop him late on. It would be a question of how many rounds Khan had in the bank from earlier to whether it would be a Khan win on points if he lasted the distance. I'd expect Froch to nick it with either a late stoppage or a tight points win.
Khan's moving up to Heavyweight to fight Wladimir, Just seen the chincheckers do a poll on the general asking who's glass jaw will smash first.