If you want the most reliable technology with the possibility to add a 2.4Ghz signal booster
for long distance missions well... That will cost you around $600 dlls plus shipping and tax!! (without the booster). But.. You can get the same by buying this Turnigy 2.4Ghz
that is COMPATIBLE WITH JR MODULES for $69.99. Yes that right! You can just buy the Spektrum module for JR and you are done!
You will have 9CH plus the possibility to mod it for long distance range and the best 2.4Ghz technology on the market .
If you only need 7CH just buy the Spektrum version that includes the 7CH receiver
(cheaper), all for just $179 dlls.
Also exist many other super cheap options for the 2.4Ghz (you only care about the wireless technology no the radio itself, the transmitter box is just a bunch of potentiometers and switches converted to PPM, except in helis) just to mention some other cheap options like the Corona 2.4Ghz
with 8Ch's or the X8
. In both scenarios you can still plug the booster
Important Note: Spektrum and JR are the same company, you can use Spektrum receivers with the JR 2.4Ghz transmitters and vise versa. I heard that Spektrum is just the test bed for new technology's (like 2.4Ghz they were the firsts), when the product or technology become really mature they switch it to JR brand.