I'm very new the RC world and I'm trying to pick a radio system for a hexacopter. The three wireless components I'll probably have are the RC controls, XBee telemetry, and a video downlink.
I'm thinking RC at 2.4Ghz, XBee at 900Mhz, and Video at some frequency yet to be determined (maybe 2.4Ghz if I can change the RC system to 72Mhz).
So first, other than preventing interference, is there any reason to have a 2.4Ghz radio system over a different frequency? Any suggestions on what frequencies I should use for the 3 wireless setups thats different then what I wrote?
Also, what is the difference between radio systems? Hobbyking has some that are <$50 like the Turnigy and the HobbyKing models, but others are $200+ !!! Are they more reliable? Why would I want to spend that much more money?