I went to Spektrum when 2.4GHz came along but I recently switched back to a Futaba 8FG. The Spektrum is a good radio but I personally think the Futaba is simpler to bind/link and easier to program. It just somehow "feels" better to me as well if that makes any sense. With Futaba offering the $10 receiver with a radio purchase it is a good time to buy one.

I have never personally used the Airtronics radios but I see a lot of good feedback about them as well.