Let me caution many of you who only shop for insurance based on the price. A year and a half ago we had an electrical issue on our boat. Here's a link if you want to read about it. http://clubsearay.com/showthread.php/76225-I-d-like-you-to-meet-my-friend-Murphy?highlight=runaway
To make a long story short, the insurance I now have has completely covered the repairs to the boat to the tune of a bit north of $35,000.
What I have is called a "yacht policy" and that has nothing to do with the size of the boat you're trying to insure. It's all about the coverage they offer and the yacht policy is heads and shoulders above as typical "boat policy" this is offered by companies that don't specialize in marine insurance. Companies like Allstate, State Farm, Geico and many others offer boat policies.
It would probably pay for you to investigate the difference between what a Yacht Policy covers vs what a Boat Policy covers.
this x100, BoatUS does offer a "yacht policy" and it is what we have, but they absolutely offer a boat policy and if you don't specify Yacht policy when signing up for coverage you will probably end up in the wrong one, especially if shopping for the lowest price