I would agree with Imamouse in that I would use Kingdom Konsultants with no hesitation. While it is fun to talk with a CM, to have the same people to follow up with, make changes, additions, have them follow up and get back to you with better deals when they come available is a service you just can't get from Disney direct.
Now, I'm sure there are other great agents, although you would want them to be "Earmarked" which is a special certification BY Disney, recognizing their expertise in dealing with Disney vacations. Find someone you are comfortable with and stick with them. To have that number to call in an emergency and know they have a vested interest in making it right is a great luxury.