You can order your radio on any frequency you want. Both the TX and RX aer crystal cotrolled. It is illegal for anyone but a Technician license or higher to change the TX frequency, but it's commonly done. You buy a matched crystal set and they simply plug in. In theory, you can change from any frequency to another within the same band. In practicallity, I wouldn't stray more than 2-3 channels either side of the original frequency unless I had the radio retuned. All this is for 72 mHz FM, 2.4 and Spektrum-type radios are another animal entirely.

I have the highest praise for Hitec servos. They will work with any modern radio system. Since you mentioned it, I also highly recommend the Hitec radio systems. I've used Hitec for many years. Lotta bang for the buck in their radios.

Dr.1