First of all, those pictures of your guys' collections just warms my heart. Awesome pictures!
Secondly, I'd recommend one of these 2 companies for insurance. I use ACNA, but they're basic coverage plan does not cover insurance if I sell a card and send it to someone. The key is to thoroughly read the list of coverages to determine which plan is for you. You might also find previous threads on here with a few searches.
http://www.acna.us/
https://collectinsure.com/