I don't know what your budget is, the Futaba & K.O are both excellent handsets but come at a price, especially if your then adding a Spektrum module to them. If you able to make use of all their features obviously there's no question about getting one of these.
If your budget doesn't allow this, or you won't make use of all the features, I use a Hitec Eclipse Pro car with a Spektrum module & my son uses the Sanwa Super Exzes, both stick type radios in the mid price range.
As niggs98 said you need something that feels comfortable in your hands but I mentioned the above just to widen your options.