ORIGINAL: zope_pope
Also a point. Never say never to using more channels. I have 9c and am using eight channels in an 29% aerobat. If this were a scale airplane with retracts, flaps, the works, I could easily use a 14mz. :P
Remember, none of us thought we'd be spending thousands of dollars a year on toy airplanes.
Clearly you have to work within a reasonable budget, but zope_pope is right.
I purchased my 9C looking for 4 wing servo mixing, never expecting to need more than 7 channels. Well I know have a scale glider that uses 7 channels and, if I hook up the optional spoilers and put in the optional landing gear, I will need all 9.
Today, six chanels is really a minimum if you look to the future.