There are frequency synthesizing radios available, so you can have one radio and select different freqs. but you are looking at the high end of the price spectrum. I'd recommend a good computer radio, 7-9 channels, and put most of your planes on one frequency (poll your club to see what freqs are commonly used and pick one that isn't). Have a cheaper secondary radio on a separate freq. for your trainer (you can pick up 4-ch radios at swap meets every day for practically nothing). This way you have a good, mult- capable radio for the majority of your flying, and a backup plan available for the day you're out flying and someone else is using "your" preferred freq. Just pull out the trainer and zoom around until the other freq is available.