The G20 will fly any of the available 90 size models and quite a few of the 1.20 size depending on the finished weight. Consider 10.5 lbs as the weight limit for satisfactory aerobatic performance. Some other models that readily come to mind are the Funtanna 100, Big Stick 60, Ultra Lite Stick, Seagull Yak, Goldberg 68" Exrtra or Sukhoi, Ace 4-60 or one of the many available Cub type models.

Karol