yeah, the futabas or 9x with the custom firmware are nice because they allow for PPM out to a long range system like draong link and allow for PPM input from a head tracker.
radios like the DX8 or 7s you have have one or the other.... not both (easily)
so I use a DL with my Dx8 with no issues, but if i wanted to us a headtracker as well it would not be doable.
I have a turnigy 9x with er9x on it on the way and will be testing it with my dragon link soon....
the more channels the better