waszot, I would not be in a hurry to start using channels 5 & 6--let the uses come in their own time. It's more important to learn how to fly mid-wing and low-wing models before you start complicating things with flaps, retracts, or other functions that use a fifth and sixth channel.

If you want to build a kit, TexAg's suggestion of the Easysport is one that I would agree with. Also popular are Sig's MidStar and Four Star (mid-wing & low wing). Sig Somethin' Extra is also very popular as a second plane. I believe the Easysport and Four Star are now available as ARF's, if you prefer to go that way.