When you start instructing, you get to try a lot of diffeent trainers with a lot of different engines. The best all around is still the Sig LT40. It has a very strong design, will turn into a big glider if the engine quits, lands at walking speed and has excellent ground handling. Its also available as a kit or ARF. With a FX46 engine you can do cool stuff like hang on the prop and do torque rolls. After setting up lots of different engines, 2 brands stand out as being reliable and easy to adjust. OS and Thunder Tiger. Get the FX46 for OS or the 46Pro for the thunder Tiger. Both engines will also be good for your 2nd plane. You can find cheaper engines, but the cheaper engines have quirks that get annoying. For radios, I would follow Kevins advise. Hope this helps, Fast!