I have seen the PZ Corsair flown by an experienced pilot but do not know if it is a good second plane. Scale models usually are not good second planes but I do not know how scale this one is. I built a GP 40 size and it is not a scale model. It is an easy flying sport plane that sort of looks like a Corsair.

Any of the 'ugly stick' variants make good second planes. This one http://www.horizonhobby.com/products...ck-arf-EFL2250 is a bit smaller than your Cub. I was surprised to see how well it handles windy conditions. This one is a little bigger http://www.horizonhobby.com/products...5e-arf-EFL4025

The Pulse series http://www.horizonhobby.com/products...5e-arf-EFL4100 is generally regarded as a good second plane and low wing trainer.