RE: next radio
I own a 7C and I like it very much, but I wish I'd known more about the RD8000 when I bought my 7C. I voted for the RD8000 by Airtronics because it has some advanced features for airplanes that my 7C does not have. One big problem that is looming for me is elevator differential for airframes that require seperate servos for left and right elevator halves. The RD8000 is much better equipped to handle more advanced setups like that than the 7C.
The 7C is a terrific radio, but the RD8000 is just a few dollars more and has more advanced features.