cgw
Been spending a lot of time on here!
Having owned the D7000 from the first day it came out to the first day the D7100 came out... they are two different cameras.
They feel different: The grip on the D7100 is deeper and wider. I find it easier to hold the D7100 then the D7000.
The buttons are placed different: Take a look at the back of both. The D7100 has movie record button moved to the top of the camera. The AE-L/AF-L button is moved farther to the right on the D7100 (Making AF-ON easier). The focus selecor lock is moved... Basically the back of the D7100 is more like the back of the D600/D610.
24mp: There is a huge difference between 16mp and 24mp when it comes to pixel density. (cropping, sharpness, 'crisp-ness')
51point AF: The fastest AF system Nikon makes for DX. Incredibly accurate shooting sports / action. Makes the D7000 AF feel like a D3100 (or D5200 to be exact )
Better Build: The D7000 has a good build quality... The D7100 has an excellent build quality (comparable to the D800).
The only thing the D7000 and D7100 share is the 7 in the name. The only reason to by the D7000 is because it costs 1/2 the price of the D7100.
This seems a bit exaggerated. Most informed reviews I've read(e.g., Hogan)stress features and not across-the-board performance as the key differences. Besides, the D7xxx and D6xx platforms share a whole lotta DNA--the old Nikon game. In my market, D7000 bodies are just above C$700, while D7100s are around a grand. Not sure the price spread necessarily delivers "improvement" on that grand a scale.