Like any service that you are needing to have done, it is always best to contact a variety of providers to find the best prices and service available.  Try to be inquisitive, often times there are hidden fees they don't mention.  When I am planning on relocating, I always call a number of reputable companies to provide moving quotes for my possessions.  Often, the estimates are wildly different, and there is little rhyme or reason for the different estimates.  Find the outliers and remove them.  Focus on the reasonable quotes, and research the company online for additional information.