RE: What makes good second airplane??
By the time you fly your second plane you should be able to fly mild aerobatics like loops, rolls, cuban eights, hammerheads and do perfect landings and take offs with the trainer.
I recommended a Funtana 90 as a second plane to a friend. He is a good pilot and has never crashed his trainer. As long as the control throws are at a reasonable percent it is a docile plane. However, this plane is a beotch to fly in any wind and absolutely no fun to land in a 10 mph crosswind.
I would recommend a four star, Tiger 2, super sportster, Hobbico 60 high wing trainer or be able to add a few pounds of ballast to the F90 on a windy day. By the time you fly your second plane you should be able to fly mild aerobatics like loops, rolls, cuban eights, hammerheads and do perfect landings with the trainer.