Yup... was in the same boat "pun intended". Contact Bob over at Worldwide marine insurance. Your best bet will be Progressive. Saved me 200 a year plus upped my coverage 10 fold! Plus towing on and off water.
I'm insured on the boat, motor, and trailer for replacement coverages of 40k. 10k in electronics, 10k in equipment.
Marine insurance is all Bob does and he is the best at it. I HAD State Farm for my boat. Never again.