I always use UPS when sending large or expensive quilts, cheaper than the PO in many cases, the first $100 of insurance is free and getting more insurance costs less than the USPS.
I figure, there is a reason the PO charges more for insurance, they lose more packages. Also, having had to file claims with both, UPS is MUCH more customer friendly when dealing with an insurance claim. None of this "you have to wait 60 days" business.