About 2 years ago I had the sensor replaced in my D2x. Nikon NY did the work and the total cost including CLA was $ 450.00 which I thought was reasonable. I know the D2x is a smaller physical size (DX) sensor but $1500 seems outrageous to me. Did you get that price direct from nikon service? The camera only costs $2100 new so it seems crazy to spend 1500 on a repair - that price just seems wrong. Sell the D700 as-is not working for parts ( you mightl possibly get $500 or more) and buy a used one for about $1500.