RE: FM or PCM??
Tony,
Admittedly ad copy, I think the following quote from a well known distributor of RC equipment says it best:
"And as far as the tired old PCM vs. FM debate goes, do any of us really believe every TOC competitor in recent memory flew with PCM just to be fashionable?"
Despite the naysayers, the best fliers in the world seem to think there are advantages to flying PCM. In your specific case (the 6102 system and R700 PPM vs R770 PCM), there is exactly 20 bucks difference. IMHO, it's a no-brainer... buy the PCM receiver.
Gary L.