The Twin-Air 40 is the best around now. Easy to build, and easy to fly.
www.ne-aero.com
The Duellist 2/40 is an excellent plane, but it's not being kitted now. Plan still available. Fully aerobatic, but a lot more skill needed for the build.
Quick and dirty ARF, check the Twin Stick from Cedar Hobbies. 40-46 and not expensive.
Bill.