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If you already have the investment in Canon lenses then the 7D isn't as noisy as is often reported, especially at 400, and would be a great choice.
The focus system in any of the Canons is not as fast or accurate as the latest model Nikons though for wildlife photography. The focus system on the D7000 slays the 5D MKII and the 7D for that sort of work. I can't comment on the 1D MK IV as I don't have one. I regularly use the other 3 though and the Nikon focus system leaves the others in the dust.
I am eagerly awaiting the next round of cameras from both Nikon and Canon though, both are overdue for a new full-frame model release, and both should be something pretty special.
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