A .60 size sounds small for a 20cc gasser, but I remember it as a pretty good size plane. If you'd like to track down the wing span, square inches, and weight (I looked but didn't find it right away) I'd be happy to give my opinion.
If you don't already have the engine and are going to be buying one, you might consider the 16cc ValleyView as an option. Or the 16cc RCGF Stinger.