The Super Cub is a neat first airplane and definitely will expand the weather you can fly in over anything micro sized. But if you are planning to get into bigger planes, whether nitro or electric, and especially if you will be working with an instructor initially, I'd say skip the Super Cub and go straight to a sport plane like an Ugly Stick. You already have some basic orientation and control skills, so the only learning curve would be to handle the faster speed and response. If the plan is to stick with park flyers though, do go ahead and get something that's 4 channel. It will greatly expand on the maneuvers you can do and and the wind you can fly in. It also will keep you from having to relearn control once you move on to higher performing planes.