I would stay with a plane that has a nose wheel also. The tail wheel is very difficult to learn take-offs with.

There are a lot of good "trainer" airplanes out there that are a blast to fly. I was surprised at how much fun you could have with one. Even a used one from local club members would be good. You won't learn anything about building, but many of the new ones require very little building anyway.

Depending on your nephew, don't be surprised, though, to see him looking for another plane soon after learning, no matter which one you choose.

I learned on a Rite Flyer ( my dad is learning on it now.) Other club members use Superstars (Hobbico?) and some Air Core planes.

Good luck.

Mike