You'll want a 14.4 DS for that kind of range and adaptability. The X platform (FX and FXS) tops out at the 7.2 battery. It's just skinnier. It has half the charger, too.
Range is a stickler for bikes because they're very space-constrained. In five years, sure, maybe, those bikes will be new and expensive.
Today you could get a used Zero, tho, for about what a comparable ICE bike would be.
-Crissa