I have recently bought 2 RC air craft,a Axe CPV3,and an Exceed Piper J3,I dont like the transmitters that came with any of them,they seem not as good as they should,I was wonder if thier was a transmitter (6 channel) that I can use to fly both,NOT at the same time of course,something around the $200.00 range,something that will be compatible with the servos already installed in the crafts?