One that I haven't seen mentioned and that I feel is a great second plane is the Great Planes Easy Sport. It's sort of a shoulder wing with some dihedral, which is a lot more agile than a trainer but still slows down when you want it to. I also had a GP Stick which is okay as a second plane if you were a very good student on the trainer. I would never recommend the Kaos as a second plane as I have a friend who has one, and after flying for 6 years, I think it would be to hot to handle for your #2 plane.