My Posts: All Forum Topic
JR and Futaba also have 2.4 GHz systems on the market. JRs are based on the Spektrum system, and Futabas work a little different. You need to look at price, and what feature the radio itself has. The Futaba 6EX has limited mixes in my opinion, for instance, as best I can tell, you can't get it to do a 140 degree CCPM setup because of a lack of additional mixes in heli mode. The specktrum (even the DX6) has additional mixes, and you can mix collective to elevator to get 140 degree ccpm to work, and if I am not mistaken, the e550 has the 140 setup. They are coming out with new models, though, and one of those may be good for you. I bought a DX6 for an e325 and VERY quickly found some limitations I did not like, but the DX7 more than handles what I need, or will need for some time. Programming is MUCH more intuitive on the DX7 with the graphical displays. They all have plusses and minuses, and their own price points, so you need to get what works for you.
Note: Futaba recently came out with the 7C 2.4 GHz, which has the additional mixes, and costs about the same as a DX7. Assuming it has all the same 7C features, it should have 5 point curves, all the necessary mixes, and shold be able to do the 140 degree swash. Futaba has a great reputation and Spektrum seems to be working out pretty well, I haven't had any problems with mine. It seems that any of the 7+ channel 2.4s will work fine. Also, don't rule out the standard 72MHz systems, though the freedom from frequency pins is tough to give up once you experience it. I have been in RC for almost 20 years (on and off, and several of those were boats and cars with just a little bit of planes, helis just recently) and the new tech is great.