Upload & Sell: Off
I currently own a D300s. I have purchased an extra battery and the vertical grip. I have fairly large hands and I really find the camera is hard to use for very long without the grip.
In any case, I am seriously considering a move to FX, or at least the addition of FX to my stable. My current lenses will all work on an FX camera, except one (Tamron 17-50mm f/2.8 VC).
I mostly shoot landscapes, flowers and the slowly growing brood of grandchildren (and their cousins). I could use the higher ISO for the grandchildren, but I am more interested in capabilities for landscape photography. My primary interest is noise (not fond of the noisiness of the D300s sensor even at ISO200), and DR.
What I want is the D800, but I do need to buy at least one lens in the upgrade process, and the D800 is really pushing the budget.
The D600 has the ... "consumer" body, I guess it could be called. I am not really sure if that would bother me or not. I was given a D2x by a family relative and then bought the D300s, so I have never shout with one. However, I really don't take full advantage of it. I only use the AF ON button that so many love on rare occasions while in Live View. :-/ That said, I really like having the bulk of the shooting features on buttons rather than hidden behind menus.
The D700 has several advantages for me. I can share the grip and the batteries between the two cameras. That saves me a bit more $300 that I would have to spend to get the grip and an extra battery for either the D800 or the D600.
In any case, even with the savings sharing HW with the D300s brings, the D700 is still priced in the range of $1400 to $1600, which brings it close enough to the price of a D600 that I have to wonder why I would buy a four (?) year old sensor rather than a brand new one.
Frames per second are not of concern. Higher ISO is a feature I am sure I would learn to love, but it is not critical to my current style. Dynamic range, color and tonal depth are important to me. Of those DR is the one I see the most need for.
Resolution is not a big deal. I have taken to doing my own printing since Canon was almost giving away the Pro9000 MkII's a few months ago. I can do > 200 DPI with 12MP, and that is good enough for my needs. Maybe that implies that I should just stick with the D300s? But having the luxury of several more stops of dynamic range is calling to me ...
Thoughts, wisdom and/or insight welcome.