You might want to look at the Goldberg Protege.



It has a 71.5" wingspan; 890 S.I. of wing area; 7.8 pounds and a 66" fuse. Flies fine on a .60 engine.

It's easy to see, too. If you use aileron/rudder coupling it flies (almost) like a semi-symmetrical airfoil rather than a flat-bottom wing. No skidding around the sky.

Good luck in whichever model you choose.