I agree with the others look at your company you have for your homeowners/rental insurance you might find a better deal.
I have had insurance through a company that specializes in photo/film insurance policies - I found them stuck in the 80s with a policy package that had a lot of value on portfolios(but and iPad was excluded), fees to get proof of insurance documents when renting a location, etc.. and honesty their costs were much higher
Most insurance companies that deal with business also have plans for video/photo businesses if you need location liability so no real reason to go with the specialty companies. Business insurances have much higher fees because they have liability coverage
My "valuable personal property" policy with the company I already have insurance with is $30 for $2,500 Granted this is for equipment that is not related to my business equipment. My Business insurance is just under $1,000
So I do agree the best option really might be calling up your insurance company (car, home or rental) and seeing if they can give you a deal with an additional plan
p.s. the other question is if you plan on renting lenses I personally would rather pay for the insurance through the rental house so they have no incentive to go after your insurance.