If you want to stay with an electric aircraft, you might want to take a look at E-Flight's Mini Pulse XT PnP or Mini Ultra Stik PnP. They're both largely pre-built with motor, speed controller, and servos pre-installed. You just need to add a receiver and an appropriate LiPo battery and they're ready to fly.

Both the Mini Pulse XT and the Mini Ultra Stik are good "second" airframes that can slow down and land like a trainer, but are far more aerobatic than your Superstar EP.

The new Parkzone T-28 Trojan RTF would be another good choice. Unlike the previously mentioned E-Flight airplanes, the T-28 is made of foam instead of balsa and covering. It comes with a 72Mhz radio system, brushless power setup, and LiPo battery with charger all for around $200 or so, though. It also offers the similar "faster and more aerobatic but still stable and easy to land" characteristics that you want for a second plane.

I have a hard time recommending that anyone tries to learn how to handle glow engines all alone. I think you should stick with electric aircraft until you can find a flying buddy with glow experience to help you. Even with glow car/truck experience, tuning a glow engine while a sharp propeller spins an inch away from your hand at 13,000 rpm isn't something to figure out on your own.

Good luck and good shopping!