Best shipper for 200lb amp?

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I've had very good luck with Pilot Air. And it is especially reasonable if you bring the amp to the depot (one in most major metropolitan areas) and it is picked up at a depot on the other end. Without home delivery, it becomes really reasonable. They will palletize it for you, and the pickerupper will find them sitting nicely on a pallet waiting to be taken home. I had Classe Omega amps (212 lbs each) shipped that way.

I use Service by Air for large shipments.
I learned about them because Esoteric ships to me (I am a dealer) using their service so I tried it when I had some shipments to send and I cannot say enough good things about them.

I would second Pilot Air. I had a set of Andra II's shipped from SF CA to JFK in 4 days for $275. That's 2 large crates at 250lbs ea. I got the tip from reading here on AG.

There is also "Forward Air" Dot Com. Check their site and look
under "locations" I have been using them for years.