I'll agree with everyone else...Look if you are really serious about getting your son into RC flying, before you buy anything, go to your local club and introduce yourselves...ask questions look around, talk with an instructor..see what he would like to see you get.....
While you're at it think about learning yourself...what a great father /son activity.....there are so many things you can do in RC..competitive scale, aerobatics, racing, pattern,....or you can just come out and fly...or like me I like to teach
Good Flyin to ya