For a radio I think you should go with the Futaba U Super series.
http://www.futaba-rc.com/radios/futj80.html
Here is the deal. If you buy a used one from one of the fine folks on RCU you usually only have to spend $250. That includes tx, rx, module, crytal and usually a case. This radio will grow with your needs (with 8 channels). It's easy to program as well. Here is a link to a deal just like that on RCU that I just looked up.
http://www.rcuniverse.com/showthread...324&forumid=29]