i got a crash course form the beaumont clubs president today in computer radio functions

. today was one of there teaching days so i got to go watch and learn a little. i also got the plane my friend was giving me fixed, so all i need is a radio and engine

(free crap rules.)
so the CAF and CAP are the same radios with a diff transmitter....hmmmm
Should i save the money and buy the one with the less expensive receiver for now? or is pcm realy important?