Carl Goldberg Tiger 2 0.60 size!!! Because you already have the motor.

At my field there are about 8 of this tiger size .40 and their owners loves them.

As matter of fact I bought one to use it as a trainer for my son.

Also take a look to Ultra Stick 0.60 I used to fly the 1.20 size, that was my second plane and it was easer than the trainer!!!