For an FPV multicopter, there are a few off-the-shelf options for wireless control. 

The Open Pilot CC3D Revolution has built in 433MHz RF OPLink and pairs with an OPLink ground station transceiver.

I would also like to try using NRF24L01+ as transceivers on both the multicopter and controller.

Other possible options for wireless control can range from the cheapest end of the spectrum with HC-05 Bluetooth modules, and the more costly end 3DR Solo/Controller Link modules, though size may be an issue.