You don't say how long you've had and how much you've flown the CC Lee ????
Most of the ones you've mention are 3 channel again if you're looking for advancement would have thought the Super Cub's only going to be fairly similar.
What about a Multiplex MiniMag, if you want you can set it up as 3 channel initially and then connect the ailerons when you feel confident but it would cost you a bit more.