Do you have a local flying field near by? If so, stop by and ask the people who are flying what they have. Plus you get to see some of this stuff in action. People will have different kinds of field boxs, and equipment. Have you decided on a plane yet? Again check with the field you will be flying at as to what type of plane, and radio gear you will need. Most radios are similar in function, but they need to be the same brand as the instructors to use the buddy box function. (for training) Maybe they might even have some stuff they would be willing to sell you or something. Good luck Loren