Mlw, because you have the appropriate equipment already you may want to take a look at the Tower Kaos .40 ARF or the World models T-34. Both have great flying manners and would be excellent advanced trainers. Like John I would stay away from the popular scale aerobatic types but not for the same reasons. I feel that they can be set up to fly gently and are actually quite forgiving however they are rather fragile and you most likely need more stick time before moving into a tail dragger. Whichever airplane you choose, spend considerable time learning to use rudder. Practice hammerhead stalls, lining up the airplane on final with rudder and not ailerons and work up to point rolls. Rudder usage is what separates good pilots and great pilots.