My suggestion is the Great planes PT-40 or PT-60, I built the 40 size for my first about 10 years ago, we just finished building and flying one with my 7 year old son.

They are very tough, on my first flight with mine 10 years ago I clipped a wing on a tree and spun it into the ground and all I hurt was the prop, I was very lucky but it was up flying again in about 10 minutes.

The LT-40 is a very good airplane but just not as tough as the PT-40 in my opinion.

Here is a picture of my sons from last weekend.

Weskel