Ended up pulling the trigger on the RX-471W. Now to hope customs doesn't charge me extra for it... I guess we shall see. Will probably take 3 weeks or more to arrive. Since it's waterproof I can use it in my Traxxas as well as for a crawler if I buy one for the summer and not worry if I end up in a pond or something.

Also ordered a 1600mAh LiFe battery for the MT-S, that should arrive this week already. Considered ordering a second one for the MX-V (currently mostly using it with an airsoft LiPo), but with the second receiver coming for the MT-S I'm not sure if the MX-V is going to get used. And at least I can test-fit the first battery to make sure it even fits on both, though based on dimensions it should.