While I'd normally agree and myself went from the Futaba 4 channel rx that comes with a Nexstar to a 9C Super while I still had the Nexstar, going to a bigger radio does not solve the OP's "which plane" question. He doesn't even seem sure he WANTS to go beyond and considering the price tag on the PTS Mustang it really is an excellent option. If he decides to go on the DX6i will serve for quite a few planes and he can buy the DX18, 12X or 18MHz somewhere down the road....