Sig Kadet Sr. would be my first choice. Incredible plane to fly, extremely well built, and its a blast to do touch and go's with as well. Later, it is an excellent candidate for floats if you want and it takes a minimum of power to fly it. By far one of the best planes out there to learn crosswind landings and take-offs using ailerons and opposite rudder. When you get good with it you can do one wheel touch and go's and alternate wheels, again using ailerons. Will do all the basic fun stuff as well such as loops, rolls, tailslides, hammerheads, etc.