The Supercub is a very popular beginner plane, the same as the Slowstick, they are rather classic trainers you can get started with relatively inexpensively. Looking at them fly, and actually flying is a huge world of difference, these birds will be plenty fast for you to start out with. If you are going to shop around, look at planes that specifically state trainer, avoid anything that sais intermediate. Meanwhile, get plenty of simulator time, FMS 7.0 is free as well. I also reccomend just to get basic orientation figured out and not risking your expensive gear to get an aeroace, your son will also enjoy the fact that he can fly it all day long and no worries about crash damage.

When I first started, about 3 months into it I bought a Multiplex Microjet because I thought it looked cool, well, clearly I was not ready for it so it collected dust for a couple of years, even now, it's a thrill due to the speed it produces, especially with the brushless and lipo upgrades. I can't imagine how I'd handle it if I were to get it launched successfully when I first got it without either losing it or possibly causing damage to other peoples property. These are not toy's, it's literally just like flying a high performance power tool so be careful what you get and where you fly.