I've gotta vote for the Russell Wading Shoes. They are customed made to the size of your foot. They're not cheap, but if you have a problem with off the shelf sizing they may be the way to go, especially if you spend a lot of time in your waders.
My next pair of wading boots will be Russells.
http://www.russellmoccasin.com/shoes_wa ... ssell.html