If it is within your
budget, I highly recommend skipping DME and going with town car service; we believe that time is money at WDW, and unless there was a major problem with your luggage or a huge traffic snarl or something else completely out of the ordinary you would have no problem being at your resort by noon if you went with a town car. You would also have more time on your last day, since you don't have to get to the bus as early as they make you in order to allow for all the other resort stops, etc.
We pay about $115 round trip with Tiffany Town Car (plus tips each way) and firmly believe that it is money well spent.