You are most likely contemplating several people taking showers, doing dishes, maybe even fresh water heads for that usage level. I say, good on ya. If you can make the water, why live in h2o poverty.
I've done similar research and like the spectra watermakers with the auto-controller. Unless you are going to be on an extended cruise, you probably won't use it as much as you imagine. The auto-controller will cycle the system every so often to be sure it remains viable.
They make them of all capacities. The more gph, the more expensive. Keep in mind that you won't want to run it all day, so you need to calc the gph necessary to recover your needed supply based on house batt capacity, engine run time, genset runtime, etc.
Personally I don't want to have to manage power for it to run more than 2 or 3 hrs per day. Your consumption will require mid-range production and price to pull that off.