There really is a difference between 6 channel radio programming and 7 channel radio programming. I would be a little surprised to find a pilot flying a Yak with a DA100 who didn't really want a 7, if not 10, channel radio.

I had a 6 (even an 8) channel radio, and it was incapable of some functions that are 'basic' on larger aircraft (dual elevator setup, dual aileron setup, simple knife edge mix, etc.)

I'm not starting the argument here that one needs X amount of channels to fly a plane, but you (I) get to a point where you expect certain things beyond the capabilities of a 6 channel radio.

Best thing is to figure out what you really want before buying a new radio.