Oh, I just check servo city. You can get a 9C set up for like $379.00. I'd buy that over the E-7. I love mine.
http://www.servocity.com/ServoCity/P...ol_units_.html
As far as PCM or PPM, flip a coin. PCM RX's will be more expensive. The buddy box works with either. Find who told you they don't and slap them
