hi try the artronics vg 6000 computer radio with four servos etc as standard i was lucky to get mine on ebay with a tutor 40 trainer and 46 la engine and its a great easy to understand computer radio made by sanwa its got everrything youll need and will last you for a few models!!.fully digital 6 channels 4 model memory exponential, flaperon,differential rudder mixing and elevator to flap mixing .delta wing vtail etc etc.its a nice bit of kit and you should get it cheap over there as our prices in uk are the same in pounds as youres are in dollars ie costs me twice as much lol!!
good luck mate!!ps im quite new to it but its easy to understand once youve read through the book lol!!!