Sun 23-Dec-12 11:15 AM | edited Sun 23-Dec-12 11:18 AM by ericbowles
I favor the D600 over the D700 by a good margin. I have the D600 and have used it extensively under a wide range of situations. I also have a D800E.
The pros of the D700: The frame rate of the D700 is a little better It has better build quality It has more AF sensors - 3 more in each corner. Not important for birding since you use the center sensor and back button focus.
The D600 advantages: Newer AF system - and better in my view Double the pixels Better dynamic range Updated battery (not better or worse - but the same as every new camera) Two SD cards - storage and flexibility Movie mode Newer technology by about 5 years
I consider the dust problem a non-issue.
You might consider waiting for the announcement of a new DX body with more pixels on a crop, but my guess is you like the advantages of FX. While you wait, the D700 will continue to drop in value a little more and the D600 sale will end.