I use a D700 with a grip for family, travel, portrait. I have mostly FX lenses. What I do not have with my D700 is video capability. So I'm leaning more toward the D4 only because I'm happy with my D700 setup, don't really need the resolution of the D800, and I don't print poster-size prints. Unless someone convinces me that I should go with the D800 for my type of photography.