Being proficient on the simulator doesn't automatically equate with actual flying. Simulators are nice but, in the end, they are video games not a real airplane, with a real engine, in a real sky.

That Extra might just be an expensive lesson if you try it too soon. I'm thinking about working on my full scale pilots license again. Do you think the instructor will want to train me in a Cessna 150 or will he take me out to the National Guard base and strap me into an F-16? Learning RC is no different; a natural, safe progression is the way to go.

Take the advice here. Move up to a more traditional second plane. Someone suggested a Stik and that may be a good idea for you if you plan on getting into 3D. The Stik isn't a 3D plane but it can do some pretty cool maneuvers but is still forgiving enough for a newer pilot. Then move up to a smaller 3D plane eventually getting to the giant scale aerobatic stuff when you are ready. You'll have a much happier, longer and less expensive love affair with this hobby if you do.