I wonder what happened to the OP?
Anyway, the Tripp Lite 750 he has is a 750 watt inverter / 45 amp charger with an automatic transfer switch.
All of his wiring, including the output circuits fed by the inverter will be based on that. Going to a larger unit would require lots of changes.
Replacing it with a similar capacity unit would avoid that.
Upgrading to a PSW unit at this time would make sense unless the $$$ are a problem.
I love Honda generators. I wish everyone in the nascar infield would use one.