If you're moving up to a 4ch plane, plan on spending at least $300. As far as what to buy, to learn aileron flying, I'd suggest Wattage's Crazy Max. Flys great, and is easily repairable. It's cheap at $45 bucks, comes with the motor/gearbox/prop. So then you need a radio $80-120,(try to find a used Hitec Flash5x as it has expo. and dual rates. Extra servo$15-25, battery(ies)($25-$75), and charger(MRC's SuperBrain $60).