I'd like to make prints that are 4 x 6; never bigger. I see your point; 16 is not enough difference that the 12 on the D3s. What I run into with the D3s is that if I crop, then the resolution is reduced. Maybe not enough to matter.
This is a grand trip and I want to have enough camera 'power' to document it. I won't be able to go back and reshoot.