I have the Atx RDS-8000. I say don't get it. It has some very limiting features that not even their reps had realized. If I knew about these I would never have bought it. Their new 10ch seems really nice however.

As far as the 3 you mentioned, it is a toss-up. Get what you like, what feels the best and has the features you like - they are all good.

Futaba has one Rx box with two small antennae in the plane, Spektrum has two RX boxes in the plane but has model match and more RX options than any competitor right now.

Personally I like JR/Spektrum radios for the way they feel in my hands. I didn't love the 'programming language' of my Futaba, however you can do a whole lot with it when you fully understand it.

I have used the Futaba 6EX and Airtronics RDS8000 and am now shopping for a JR X9303.