I will second Pilot Air. VSA uses them to ship big speakers, which I got with no problem several years ago from Cali. I also got a tube amp using them from VAC in Fla with no problems last year. Prices are pretty reasonable and they take care of things. My advice would be to be sure to use a pallet.
On the flip side, I've had both Fedex Ground and UPS destroy things, then try to get out of responsibility for covering them.
On the flip side, I've had both Fedex Ground and UPS destroy things, then try to get out of responsibility for covering them.