All of them are fine radios. I own the older 72 MHz Airtronics RD6000 and RD8000 and they are fine radios. I have not upgraded to the RDS8000 because I also have a DX7 and a DX6i, both are fine radios too.

I had a Futaba basic four channel but that went with the plane it was associated with when I gave that to someone.

CGr