George,

My advice to you would be to change your thinking somewhat on how you approach your son's next airplane. IMO none of the airplanes you have listed are a good choice.

Please let me explain why! At our club we have a number of young R/C pilots about your son's age flying very proficiently. Each one of these young fliers has been trained by an instructor using a 4 Channel glow powered trainer until they were able to be cut loose to solo. Although simulator time is good, nothing beats time with a qualified instructor using a buddy cord to avoid mishaps. A trainer type airplane is a forgiving airframe which will teach him solid flying skills which is very important at his stage development. Minnflyer and R/CKen have compiled a good list of suggested trainers to pick from excellent for training.