Go to Sure Marine and explain your situation. They are some of if not THE best marine heat resource in the country, and they are right in your backyard. I am guessing they will tell you to replace your forced air heater with a similar unit. Hydronic units are great but you already have all the air ducting run for forced air. Electric is a lousy option unless you never plan to leave the dock.
Figure out a good central location and install a radiator to scavange heat from the engine. People call these bus heaters or Red Dot heaters, Sure Marine has a bunch of options. That will give you a bunch of free heat anytime the main is run and will be a good supplement to whatever you choose for your main heat.
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