I have a personal articles policy with State Farm that covers all my equipment. I gave them a list of everything I wanted to include with a dollar amout attached to each item. I listed my bodies, lenses, filters, flashes, cables, and even my laptop. This insures my stuff not only against theft but breakage as well. In PA it costs about $1.06 for every $100 you insure, so $10000 in coverage cost $106 a year. I think that is cheap for some piece of mind. There is no deductable on this policy.
Camera theft can be covered by homeowners/renters insurance even if it wasn't stolen from your home, however a deductable will apply.
K