James, I guess it all depends on needs raher than wants (as my son put it). It depends on your finances and the type of images you want and need. I no longer shoot for money -- just for fun, and mostly wildlife and flowers. Just for MY pleasure. Anyway, no one can afford my prices and only want bargan images, etc., You know what i mean. I guess if I were starting out, I would buy the D-700. If I could afford it, I would buy the D-3!! LOL. But again: wants versus needs. I would also want to buy non-DX lenses. THAT would really be expensive.
Due to severe leg, foot and back pain, I usually only carry the D-300 and the 18-200 lens. And maybe the 105mm macro.