My beloved D2x was getting a bit long in the tooth, ISO-wise, so with a bit of Christmas money, I bought a Nikon D7000. Not as tank-like as the D2x, but about 4 stops better in the ISO range, as the following pics from Carbon Leaf, show.
The auto ISO function on the D7000 is great. I can set the Aperture and Shutter speed I want, and the camera will set the ISO for proper exposure. I found this function very helpful. One less thing I have to worry about.