I will second the choice of the Hitec Eclipse with the Spectra module if you want your planes on different frequencies. I have both the old Prism (with Spectra) and the new Eclipse with Spectra and find them both very useful. I often test other peoples flight systems, and with the Spectra and Eclipse, I can drive any brand of PPM (PWM?) receivers and check them out on any of the allocated RC channels in the USA 72 MHZ range.