If the money stretches to it a Nikkor 70-200 f/2.8G VRII and TC-20 EIII would be the best pick.
I would go the 70-300 over the 120-400 without having used it. There is a tendency for the Sigma zooms to be slow at focus acquisition. From what I've been told the 150-500 is very good but slow, especially at the 500 end.


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@ 70mm
@ 300mm


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