I'm partial to Spektrum, myself. I have a DX7, and am considering getting a DX6i as well. I believe Spektrum radios have more features for the money (compared to Futaba), and Spektrum has about 8 different receivers to choose from. Airtronics has an 8 channel out now that is a good value for the money (RDS8000), but only one receiver is available for it, and I've never liked the look of the Airtronics aircraft radios, myself.

I'm sure Spektrum, Futaba, or Airtronics will serve you well, just look at the features, prices, and availability of receivers for each and decide which is best for you personally.