I have coverage through Thomas C Pickard Inc. on the West Coast, and the insurer is The Great American Insurance Agency.
I pay about $1200 per year, all my equipment is covered, which adds up to about $100K, throughout the world regardless of how it is stored or transported. I also have $50K in rental coverage. The only exception to my insurance is if I loose or forget an item.
I also receive $4M in yearly liability with $2M aggregate on this plan.
I use to have coverage through a local agent with the Hartford group. However, their plans are more geared towards wedding and event photography, and they became leery covering someone with so much commercial equipment. They also stopped covering photographers who put themselves in what they referred to perilous situations, such as high balconies and rooftops. When I switched and told this to Pickard Inc., they just laughed and said, "we cover photographers who put themselves in much more dangerous situations then rooftops."