I just went to State farm and have mine insured. The personal valuable article policy. They will pay out the amount you insured. So I took the list of price of current sales price on BHphoto.com. It is not depreciated value that they pay you over time. Individual item over 5000 needs bill of sales (for you guys with big lens and big cameras).
the price for non-professional is $1.30 for every $100 or $13 for every 1000. So stuff in my signature comes out to be about 70 bucks a year.
price for professional is $2.30 for every $100 or $23 for every 1000.
Keep in mind it does not cover mechanical failure, wear and tear or natural degradation. If stolen or lost, my agent told me to best have police report if I can even if I travel out of country. Best to have some kind of official document. And a bunch of other stuff, better to talk to an agent to get the details than from me.
Just a summary of what I got.