I just want to say that this Nikonians Forum is the single best place to learn, and to ask questions! It is just mind-boggling how many who post know some much are so generous in sharing their knowledge and experience.
&, I would be remiss if I did not offer a big thanks!!!
As for help deciding whether to take the leap and buy a D600, I think this whole D600 thread stands alone as being the best place to learn what you need to know to make this important decision. The announcement of the D600 was only a couple of weeks ago, and Nikon's ability to fulfill orders this quickly, and this Nikonians' Forum's ability to address all questions flooding in even more quickly, and to share meaningfully early adopters' experience, is simply unmatched on the internet.