I use a company called anchor marine.

http://www.anchormarineinsurance.com/

Look into a “yacht policy”. It isn’t just for yachts, it’s a type of stated value coverage I can’t remember the details of at the moment, but it was recommended by many folks when I was insuring my boat. Being boat specialists, might be worth a call just to get an idea of what’s what.

“Life is life and fun is fun, but it's all so quiet when the goldfish die.”