Secursus, excellent choice
I used Secursus twice in the past months. It was an excellent experience : no hidden small rules, clear explanation, fast and smooth procedure of insurance, very fast answer on my questions. And for incredibly competitive prices. Of course you hope that your shipments arrive without problems ( which was the case), but it feels good if you know that your items are properly and well insured. For me, as a private person, member of a group of collectors, who exchange items or sell sometimes an item to other collecting friends, it is also very convenient that the written agreement between 2 people is an excellent option. I just can recommend Secursus for the experiences with them so far. I sure shall use their service again.