D600, D700, or D800 - overasked for sure!!!

We're talking $600 difference between D700/D600 so I don't think that is a ton of difference.

if I were you I'd compare features and decide that way. All three cams are great IMO.

--
Best Regards,
SteveK
'A camera is an instrument that teaches people how to see without a camera.' -- Dorothea Lange
http://images.nikonians.org/galleries/showgallery.php/cat/500/ppuser/119002