A hydronic system would still want makeup water available, so that would still be a weak point even if you did use antifreeze (the use of antifreeze requires a slightly larger boiler since it actually transfers less of the heat verses pure water).
A forced-air furnace can be zoned, but it costs more. Done right, it doesn't need to be drafty or dusty. It likely would be the least expensive to install, too. Depending on what you have for places to run ducts, you could go with one of the high velocity, small duct systems where the outlets are in the order of 3" or so.
If the electric rates aren't too bad, you could go with a split a/c-heat pump system. But, in Maine, it would likely use a bunch of resistance heat. You probably wouldn't need the a/c often, so that may be a poor choice.
You also need to deal with the toilets - you can drain the tank but if you don't leave something in the bowl, you'll have a house full of sewer gasses. RV antifreeze works there and in the other traps. Not sure if you'd want to use that in the DW...maybe if you ran a cycle before you put dishes back in it. You'd have to read the label.