RE: What is a good 2nd plane?
ARF or kit build? Many of the Stik variations would be good (but not the Goldberg Hot Stik or Wild Stik). The Kangke SK-50 is a honey of an ARF with a TT Pro-46 or S.T. 51 engine. And the good 'ol Sig Four Star is always the right choice.
With any of these you might want to ask an exprienced pilot to maiden them and get the initial trim done. You want a second plane, not a ten second plane.