I started the move to FX when I acquired the D3, which replaced a pair of D2X bodies that I had been using for several years. The D3X came along a year of so later.
I kept a Nikon D40X and a copy of the 18-200 mm DX lens for a travel/walking around configuration when I don't want to lug the D3 or D3X and one or more heavy lenses around. The Panama Canal transit was an exception, and I came home with some wonderful images. I sold or traded the rest of my DX lenses, including a perfect 17-55 mm DX zoom that will appear in the Foto Forum used case soon.
I print with an Epson P7900 (24 inch carriage/sheet and roll feed) and enjoy seeing what I can achieve in the way of large format print resolution and image quality. Hence, one of the motivations for moving to the FX format. The D800E is the next logical step in the process.
HBB in Phoenix, Arizona Nikonian Team Member
Photography is a journey with no conceivable destination.