I'll chime in on this.
I needed to ship 6599 to DMC Florida for warranty work and some upgrades a few weeks ago.
I did some searches on the inter-webs for transport companies but, ended up asking Tony @ DMC F who they used, And
Trusted when they shipped their cars.
I ended up paying $875 for a bit over a 700 mile trip and was Very Happy with the enclosed trailer, driver and the Company that it went there in.
I wouldn't even Consider an Open trailer for my car.
(Of course once my car is ready, I have to pay that again to get it back to me)...
I'd recommend an Enclosed trailer and, a carrier that has their own trucks and drivers. Stay away from brokers! (If you value/love your car).
George
EDIT: Call a local DMC dealer/vender to you now, or a vender close to where you want the car moved to. See who they recommend for transporting.
Just saw Daves post.