RE: .60 size trainer kit
The Tiger 60 Kit Plane with a 60 up front balanced out perfectly, with NO additional weight required. The Tiger turned out to be a great flier, with excellent slow speed characteristics.
Whichever kit you choose, keep WEIGHT in mind as you build! Light and strong "rules"!!!
If you build too heavy, especially in the tail area which will require adding dead weight up front to balance, then you can kiss all the dreamy advertised feature's of any kit good by!