Upload & Sell: Off
A couple things to consider.
Rumors in the winds say that the price for a new D700 will be coming down given the D800. This will put downward pressure on used D700 prices as well.
As with all used equipment no warranty and 98K is about 1/2 the quote lifetime from Nikon.
At last check, most any repair going into Nikon is in the range of $400 to $600 so the way I look at buying used equipment is ask myself the question, would I still be happy with the price if I needed to send it in for a repair cycle. If yes, its a good deal. If no, then its worth thinking twice.
If you know the photographer and the history of use and care then that is more than you will get with most used equipment. It's no guarantee yet its better than one that has really been abused and you just don't know it. The D700 is a great camera, enjoy.