Hopefully this will give you one idea...
This past October my husband and I did airport - universal - Magic cruise - airport and we used Florida Tours for our transportation.
We have used them twice before and they have always provided us with great service and their cars are always extremely comfortable and clean.
They have a website you can link to from the DIS homepage and you can look at their price list, see all their transportation options, and make reservations there if you choose.
We flew in on a Thursday morning, the driver met us in baggage claim, drove us to Portofino, confirmed our Saturday morning pickup...picked us up as scheduled on Saturday morning and drove us to Port Canaveral...re-confirmed the pick-up the following Saturday at the cruise terminal, and was waiting to take us back to the airport when we reluctantly disembarked the Magic one week later.
We're planning on using them for our Universal trip in May and our Disney trip in October.
Brenda