RE: JR sport SX 600 question
that radio is an excellent unit, the case and programming software are the same as the original DX6 just that the dx6 has orange nobby things and a different emitter deck. I have three of these radios one bought new and the others used, and have never had problems with range, if you are going to go 2.4 eventually you should look at a JR module based radio as they can be swapped back and forth with ease, but any of the jr recievers will work as long as you stay away from the NER series, they are PCM and only work with my fancier JR stuff