Cagger << but part if that price drop is probably due to the D600 coming on to the market>>
I'm not sure I believe that. I think it is more likely a reaction to the price drop of the Canon EOS 5D MkIII.
What I do believe is that the D600 is nowhere near the build quality of the D700 or D800 and takes on the guise of a sort of FX D7000 which in turn was nowhere near the build quality of the D300/D300s.
To me the D800 represents truly amazing value compared to the D600, providing the user has PC capabilities to match the download file sizes. To me the D800 is a no brainer against the D600 if the budget allows. I never ever thought I'd hear myself say that The D600 to me is a FX spare camera for the D3/D3s/D4 user or for when they want to travel light, or perhaps the user new to FX who can't stretch the budget to the D800. Another £250 reduction and it will be down to the January 2012 D700 price.