Lots to learn in this hobby, firestar, so you can't ask too many questions. The radio you've chosen will be fine for the EP-42 (but get the 6EXAS--the EXH is for helicopters). In fact, it may be overkill, OTOH you won't outgrow it anytime soon. The S400 motor in the EP-42 is a very popular "economy" electric, not the fastest thing in the air, but certainly capable.