RE: What makes good second airplane??
Jumping too far ahead of the learning curve is a fast way to find out just how little you still know about flying.
If you haven't trashed out your trainer you can sell the airframe or trade in at your LHS. and swap your stuff over to a high wing semi-symetrical trainer
that will allow you to have more fun without getting you in over your head
you guys that have been at this awhile will agree that you will have more planes then you can fly soon enough no need to run into trouble when you can walk.