I'd have him favourite, he's the best and most proven fighter IMO. I can't see Froch being able to take his steady robotic punishment all night. That said, Dirrell and Ward are really the X-factor. I haven't seen much of either but they're both unbeaten (though untested at this level) so who knows...
Just looked at some of the odds, Kessler at 11/4 is a must-have IMO. Also, Taylor to decision Abraham maybe worth some action. Depends what taylor has left, but though AA has power I can't see him pressuring Taylor down as Pavlik and Froch were able to do. I think the fight is in Germany though as it is listed as 10pm BST start time so if that's the case maybe favours AA a bit more.