Best bet =
www.uship.com
I have had plenty of stuff shipped - including complete cars/trucks/parts and never had one issue. Just make sure that they have insurance and that they have enough feedback to make you comfortable.
People will bid on your transport and to list up an item is FREE and you have no obligation to use any of them if you don't want to.
I have no affiliation with them - just my personal experiences.
**Most online shippers work on reputation - hence the feedback on uship. If you want to try another route and see others who have reviewed other services you can look at
http://www.transportreviews.com/ and get some other choices**