There are many ways to go. Most people start out with one radio. When they switch planes, they remove the equipment from one and put it in the other.

Later, you can buy more servos, so all you have to change is the Rx, Batt, and switch. You can update again and get another Rx. batt and switch so you don't need to swap anything. Or, you can just ask a significant other for a nice radio for you next gift-getting occasion

But be warned... Getting a $200 radio as a gift usually requires giving a $200 jewelry item in return!