Roger, if I may ask a delicate question -- why so many? Why 3 M8.2's and 2 M9's? Do they fail that often? How do 4 backups help?
I know that when I do an important shoot, I always have another camera, but it is not always the same type. So for example, if I am doing a wedding with a Hasselblad on film, I will also bring the D3 and shoot with it as well. I am just curious what the reasoning is, because if I were to have the same outlay, I would think that a better decision would be to get 1 M9 and 1 D3x -- they are more complementary, each with their own strengths and weaknesses. To backup the M9, I would either hang on to one of the M8's, or use a film camera.
This is by no means a criticism, I am just trying to figure out what your rationale is...