I recently graduated from my trainer (also an Avistar) to an Ultra Stick 40. This was a great 2nd plane for me. It is relatively easy to fly and land as well as being able to do some decent aerobatics. Its a tail-dragger configuration and you can set it up for flaps if you wish (you might have to upgrade your radio of course). I would agree with the other guys - keep your P51 for your third plane.

Ian