Look for the Great Planes Super Sportster. Tower sells the ARF, and I believe it goes for $140.
This is at least as aerobatic as the Four Star (4*), and sure looks a LOT better.
Have you done "Stall Turns", "WingOvers", "Spins", "Rolling Circles", "Immelmans", "Split S's", "Cuban Eights"....? There's lots your trainer will do.

Dennis-