The Hanger 9 Advance 40 seems to be a nice flying airplane, and it looks better in person than it does in the ads. I would also look into a red Great Planes Ultra Sport 40. The covering is a foam backed covering, but it should be a nice 2nd airplane.

There is really quite a few to choose from, but will depend on a few things.

1.) your skill level
2.) your R/C budget
3.) your time
4.) your airplane preferences [what you like]
5.) your learning capabilities
6.) your instructors input/advice

Some people need to go from a high wing trainer to a low wing trainer, while others move right into aerobatic taildraggers. Have your instructor assess your abilities, and give you a recommendation based on what airplanes you like. Nobody will know your abilites better than your instructor, not even you. What you may think you're capable of flying, may actually be different from what your instructor knows your capable of flying.