D7000 and Sigma 70-200 OS 2.8

I've looked at EXIF stats in Lightroom and 60% of my photos taken with this lens (I have the Nikon VR II) are from 135-200mm and 25% at 200mm.  So 60% would need some cropping and 25% would need cropping down to DX size with a FF camera.  Then you have the VF issues (lower subject magnification if you're going to be cropping, and autofocus effectiveness when subjects are smaller in the frame).  As compelling as the D600 pricing is right now, I don't see much benefit in it for me.  (D7000 has sufficient IQ for my needs as an amateur).

- Dennis

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