I went D80 to D7000 and was blown away at the improvement in ease of use from the better light sensitivity and focusing. The D7100 can only be better and I would go that way if I was buying now. But that's just me. Only you can decide if its worth $400 to you. It not worth the $600 or $800 it would cost me to upgrade from the D7000 to the D7100.
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