I love my D7100, and I think the AF on moving subjects is superior to the D7000. The D7000 is a super camera too.I'd be biased toward new glass, and keep a DX body for the perceived reach you get. Perhaps an FX body, if low light capability was your primary concern.BTW, how do you like the 300/4 with the Kenko 1.4? How does it's resolution compare with the 300 on its own?
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