Need Help Choosing A Camera

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<p class="MsoNoSpacing"]Currently, I am using a 1D III for commercial use (and
sometimes a 5D).<span> I am trying to decide
on the next purchase, either a 1Ds III or 5D MKII.<span> I have read many reviews for each body.<span> There is an assignment coming up that will
require a higher resolution camera.<span>
Outside of the typical reviews, please provide some real world input (likes
and dislikes).<span> The assignment could require
a body as robust as the 1Ds, but I am not aware of all shooting conditions yet.<span> Also, please provide input as to where gently
used 1Ds’s can be obtained it needed.<span>
Thanks again, and I look forward to your input.