My vote is a 7D with a 24-105. You get the durability you need and a comfortable range + a familiar feel and high FPS when needed. The IQ is there provided your not shooting 50% of the time in a dark bar. Put a rapid strap on it and go sans case.
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Here is the Video for Lens Compression.
However subject isolation is also a result of magnification as well as distance, so the 5D at 168mm would appear to have a shallower dof for a given same aperture.
I've never used one but I have used the 1Ds mk3 extensively for the last 4 years. This is a full frame camera but I am lead to believe that the 1D mk3 is a crop sensor? the 1Dx is a full frame but the 1D mk4 is crop and a 1Ds mk4 was never produced.