Spektrum DXE: http://bit.ly/22oTWkR

The new DXE RC transmitter is the cheapest 7 channels radio from Spektrum. You have most of the functionalities from a higherend Radio with the help of your Iphone or Android device (coming soon). You can alternate between your different BNF models directly from your phone in just one click.
This transmitter combined with BNF models is the most affordable solution to start this hobby.