Build on the GB cub while you fly your arf trainer. I have a GB Cub and have flown several other cubs including the kit from tower and they all can be a handfull on the ground. Throw in a little cross wind for real excitement. Most all cubs fly ok once you get them in the air.
I also like the avistar, I used one to train others for a whole summer, but lately I have helped several newbe's with the Alpha and Arrow models (from horizon I think) and I like the way they fly. The nexstar is ok too, no better or worse than the cheaper models.
Fred