I may be wrong here but I believe the D200 is weather sealed. So... If your photography involves crashing around in the great outdoors (extended trips, rough camping, safaris etc) and you rely on zoom and AF then stick to the D200 (much more versatile).
I don't own a D200, but I can tell you a story that may be helpful about my D2X, which is similar in a lot of ways:
Three weeks ago I was in Victor, Colorado, shooting pictures of the Cripple Creek area gold camp. As I walked down the street, I saw a building to my right that I wanted to shoot. I stopped, set up the camera, made the shot, turned around and started setting the camera back to my defaults as I started on down the street. Unfortunately, there were two unmarked steps in the sidewalk right in front of me that I didn't see since I was focussed on the camera. I went down both of them on my face, ripped the skin on my forehead, which was gushing blood, smashed my prescription sunglasses, and, worst of all, saw my D2X crash to the concrete. I had a 24-120 VR lens on the camera and that was totalled. The lens barrel actually was bent. I was sure the lens mount must be bent too. But over the next two days, using my two very black eyes, I tested and tested, and found that outside of a couple deep scrapes along the left side, the camera was intact and working perfectly.
Then I thought about Sailor Ted, who, as someone put it, went strapless as one of his M8 strap anchors let the strap slip out. His M8 hit the concrete and was totalled.
I'm not sure that tells you much about the M8, but it does tell you somthing about the way Nikon builds its cameras. Keep your D200 if you're working anywhere in the wild.
