This is another company that my brother sucessfully used. 888-362-2807. Roadrunner Auto. He said their rates is pretty good for door-to-door service.
However, I think that DAS has the best rates for drop-off service. Drop off and pickup in San Diego is convenient, right off Mission Gorge in Grantville.
All in all, I think that they are all brokers who shop the services out to independent trucking companies. DAS does provide ship tracking so the truck have some kind of integrated logistics system.
As far as the top rack is concerned, you might like to pay extra if you baby your car. But I think that the top rack might get more road debris as the truck is rolling down the road? Not sure.