RE: Need advice to buy an RC Plane for a kid.
George,
A word of comment on your choice of airplanes.
As an instructor at our club the greatest amount of instruction time is spent with the student teaching them takeoffs, approaches, and landings. I question the decision of purchasing an airplane that you will have to modify later to make takeoffs and landings as that is the greatest "Hump" that most students have to get over in their initial training.
Your son will quickly learn to fly the airplane around the pattern pretty well, then the harder part begins. IMO a standard trainer would be a better choice because the airplane can complete the learning goals without wasted time making modifications.
Good luck and keep it fun!