Depends how nice of a car it is you are transporting, but I will say this, I used
www.uship.com to ship my nova out to Indiana, and it worked out awesome.
It's a message forum style site, where you, the customer, posts up what you want to ship, and shippers bid for your business. Since my Nova was not painted, and just needed to get out there, I used it and it was CHEAP.
But when its done, and ready to come back, I'll be using Intercity or Reliable. Or I might go pick it up myself, LOL.