Always USPS, Registered. On high ticket items the insurance rates on Registered is actually cheaper than plain Priority, even with the Registered fee.

And the USPS will always pay, not so UPS or Fedex.

In 20 years of shipping, including eBay items and business items, they actually only lost 3 shipments and damaged one. They always pay.

And as described by F2F above, bring it to the PO and get a receipt when it's scanned.

My problem lies in reconciling my gross habits with my net income.
- Errol Flynn