I had a 15cc gasser on a 60 size Extra. This was very heavy, flew like a brick.
So I put a 90 FS into this and it's one of my favorite planes now.

The gasser went to a 60 size stick plane and does very well. The huge wing surface can handle the weight with no problems.
And this flies so well, it makes a great trainer.

http://www.valuehobby.com/airplanes/...ik-series.html

Even though it's a tail dragger, ground handling is very easy and predictable.

Other then that, I'd get a trainer for a 20 to 30cc gasser, if you don't like glow or electric motors