Hubby has Hangar 9 Extra Easy trainer. Virtually everything is put together for you and it is a nice flying plane. It has a computerized radio that comes with it and installed so the transmitter, flight pack and engine should be useful in most second planes.

I have the Sig LT 40 and is equally as good but does require a little more time to put together and then you have to choose and engine and radio (which can be a plus or minus).