Originally Posted by MarkA

I would go with the "standard" R203GF for the others - HV receivers (and even servos) are for when running them direct off a lipo in a Nitro car. A standard BEC input via an ESC is 6.0v. You could save a few bucks with the 6-channel idea but in that case, two external antennas are overkill for a car and just get in the way and the other cheaper 6ch one is range limited for "indoor flying".