Actually, Questo, if you're really flying the Hobbyzone Super Cub RTF really well and enjoying the sport, an electric warbird might be a good second plane for you to think about.
As was previously said, congratulations on successfully flying your Super Cub! My first plane was a Hobbyzone Aerobird Challenger, and I spent more time beating that poor thing into the ground and repairing it than I ever did flying it. I'm happy to report that glow planes have since provided me with a great deal more flying success.
There are plenty of good electric powered warbirds by Parkzone, E-Flight, GP Electrifly, and others that are appropriate for pilots looking to upgrade from planes like your Super Cub RTF. They still won't prepair you for flying a big scale glow model with a 2HP motor and retractable landing gear, but they will move you along with the skills you'll need and you could have a lot of fun with them.
http://www2.towerhobbies.com/cgi-bin...?&I=LXHPC0&P=7
The Electrifly Corsair listed above is an ARF and will require additional parts and building time. This might be adventageous because, although it will require additional time and money to get airborn, you can put it together with exactly the components you want. Any additional equipment you purchase like a high quality 72Mhz or Spektrum radio system (for example) can be used later on even more advanced planes.
While Parkzone doesn't make a Corsair RTF package yet, they do offer the P-51 Mustang, FW190, and Spitfire. These planes are ready-to-fly, and if run with an optional LiPo battery instead of the included NiMh battery pack, offer very solid performance.
There are a lot of cool options available for you to consider, you have the tough job however as you will eventually have to pick one. Good luck!