RE: Ready to buy...Last minute questions
You might look at the Hitec Optic 6 which is very similar to the 7C and far more capable than the 6EXA, and get the TX only with Spectra synthesized module which will allow you to select any channel for about $179.99. Then, get the flight pack you need for your particular model; Hitec offers flight packs for all types of models as well.
You will be stuck on the channel you purchase the 6EXA or 7C on since they do not use a module and it is illegal to change crystals in the transmitter without retuning. With the Spectra module you can just dial in any of the 50 channels and then match the channel in the receiver with a crystal.
Mike.