By far the best I've ever used. I've shipped 5 or 6 cars before and they're the cheapest and fastest -- enclosed carrier. Highly recommend them. Ask for Michelle, she will hook you up and if you want you can tell her Graeme with the Porsche told you to ask for her.
Sorry if this is too late. I used Passport Transport recently. The second most expensive quote that I got, but it's just one company, not a broker that may pawn you off to who-knows-who? Enclosed carrier, very good service, no stories.