Stone is right on! DOn't bother with a 40 engine, get a good 46. Its like $5.00 difference cost wise but is a huge difference in available performance. This really helps if the wind whips up and you could use the extra power. The only thing with the Avistar/engine combo as suggested is that you probably won't want to take the the engine off the plane once you learn how to fly it. The plane is strong, forgiving, has a wide speed range and is aerobatic. You will probably want to keep it even if you get another plane.