since my switch to the big N, I'm really looking forward to this D600 as a backup body to the D800. If it pans out, nikon will have a sweet FF lineup
D700 (8 fps low MP)
D600 (5-6 fps, mid MP)
D3X (though build, mid MP)
D4 (tough build, fast fps, high ISO)
D800 (big MP, high DR)
wow.

Now if they can just mix them all into the nikon D4XS
