Not sure of any 5 channel radios. BUt 6 and 7 are readily available. As are 8, 9, and 10. There is plenty of merit in buying all that you can afford right now. a 4 channel will get you into the air, but you will soon outgrow it--even if just for the fact of not having model memory and such. the 6 channel computer radios are really the way to go--and you can get into some of those relatively cheaply. However, if you are going with one of the RTF combos, just use the tx that it comes with. later on, buy a better tx and use the 4 channel jobbie as a buddy box for showing your friends a good time now and then--or for teaching others how to fly.