Can't beat a Cub. Easy plane to make look really good, not a difficult plane to fly, once you get used to its characteristics. 1/5 scale has a 84.5 inch wing, not too big, 1/6 scale is about 72 inches. 1/5 Sig kit is an awesome build, lots of info on the forums, and will fly great on anything from a .46 2 stroke to .56 4-stroke.

If you prefer an ARF, Hangar 9's 80 inch Cub is very nice, same power range.