Also, for a few bucks more, you could have a 7 channel radio. Hitec's Eclipse 7 is an excellent radio (I have had one for a year and think it's the best thing since sliced bread), and users of the Futaba 7C I've spoken to are very happy with that as well. Not to knock the 6X, but several heli pilots in my club had them and ditched them because of their difficulty in programming--the 7C is supposedly much better.

It looks like Futaba has shifted enough sales from the 6X series to the 7C and 6EXA that the 6X is dropping out--I can't find it listed at Tower or Servocity anymore.