I have the D80 and am quite happy with it. For a plastic body it is very well built, with exception of the flimsy memory card door. And talking of memory, it uses the less professional (to some) SD card, rather than having the option of a micro drive in a CF card.
It also lacks some of the preset features of the D200 which I think would come in quite handy.
Picture quality is excellent in low ISO but can be quite noisy when going 400 or above.