Damn the D600 and D800
I own a D700, D800 and D4, I find myself reaching for the D800 often unless I am shooting a sporting event.
The camera is something special. If you don't need the extra 12mp, I would buy the D600. The D700 is still a great DSLR IMO and is built tough to boot.
All the best and keep on shooting
Boston West Photography