Anyone have a recommendation regarding which auto transport company to use when shipping a Benz coast-to-coast?

I've used Reliable Carriers before and had excellent service. But they're pricey and not every car needs enclosed transport like they offer. Others of similar reputation and price include Horseless Carriage, InterCity Lines, and FedEx Custom Critical Auto Transport. These are the companies that transport concours cars...

Has anyone used Dependable Auto Shippers? They offer open carriage and are a lot cheaper, about a quarter of what Reliable and the others charge.

Any other recommendations would be welcome!

Thanks