Thier are much better planes out there than the Nextstar. Your better off with a cheap Tower Hobbys trainer with a good .46 engine that you can swap into your second nitro plane. The Tower trainer is a good plane for the price and I believe a trainer teaches you things you wont learn on an aerobatic plane.
I built the GB Cub with a cilpped wing. Nice plane but they well not take a rough landings . They are very weak in the fuse area where the wing bolts on. Ground handling is terrible on Cubs , once you get it down , you can take off anything. The Cub just wont take the beating a trainer can.