Allow me to reiterate.
If you're building a 250 quad a Fly Sky T6 (not to be confused with FrSky) would be fine.
Six channels = 4 for Pitch, Roll, Aileron and Throttle. 1 channel for "Flight Mode" switch.
Last remaining channel can be used to turn on/off led lights or whatever you choose.
Since you previously stated an interest to build a 450 size quad and might be attaching a camera and maybe a gimbal, I would get something with more than 6 channels.
If you can part with the cash the FrSky Taranis RC X9D Plus will do everything you can ask for.
With 16 channels, you'll never run out!
Out of Stock now, but.http://www.getfpv.com/radios/frsky-taranis-x9d-plus-2-4ghz-accst-radio-x8r-combo-w-case-mode-2.html