>I would like to know exactly how you shoot AF-C in Focus >Priority mode and focus/recompose with a D7000.
I'm not Stan, and I don't have a D7000 (or a D800 or D600...), but if it helps I can explain how I've always used the AF-ON button on its own for focusing on the D200, D300, D700 and D3s:
1. Assign AF initiation to the AF-ON button only 2. Select AF-C mode (Release Priority) 3. Put your selected AF point(s) over the subject 4. Press AF-ON until focus is achieved 5. Release AF-ON 6. Re-frame if necessary 7. Press Shutter Release
So, no need for AF-L. That's for static subjects, of course - for action shots I don't re-compose as such, but rather select the AF point that gives me the framing I want, keep that over the subject as it moves and keep AF-ON pressed while releasing the shutter.
After doing it this way for several years, it's second nature now, and should work just as well with a D600 (or D7000)