RE: Second and 3rd plane.
My second plane (coming from a Kadet LT-40) is a 40 sized U-Can-Do w/ an O.S. 46AX engine. Got it on sale a couple of weeks ago from Tower for about $135.
Don't let the "3D" part intimidate you. I set my plane to low rates and it flies like a trainer. The biggest difference is that it doesn't "flop over" like the LT-40 does when I do stall turns, split-S's, etc.
It takes off and lands like a dream - even though I'd "heard things" about taking off and landing tail-draggers.
Good Flying.... Roger