Upload & Sell: Off
The good news is they're both outstanding cameras. One has a little sturdier build and (for me anyway) more familiar control layout. The other has the edge when it comes to image quality and some of the newer feature set, which of course includes HD video in case that's something you'd utilize. Personally I'd recommend the D700 used vs new, because for the new price you can get into a D600, and to me anyway it's a better camera at the same price point.