Remember that 3D planes are purposely built to be VERY light, which tends to make them quite fragile.

By the time you are ready for them, hard landings should be a thing of the past.

They are also to be flown slowly.

A great 3D plane in the size you are talking about is the U-Can-Do 3D.

It is a great into to 3D, but it will break if you breath on it too hard!

The AMR planes are also fantastic at 3D, and the Addiction just has to be seen to be appreciated!