I think the D200 would be perfect for you Nick. The ability to change most settings on the camera from the top & back panel I would expect to a be a godsend in your line of shooting. Then add the robust build quality & hopefully it will keep up with your falls
As for lenses the 18-200mm lens is very good, but would you not prefer a fixed f/2.8 lens to throw the background out of focus ? The Sigma 70-200mm f/2.8 would be a cracking lens, & we know Dod shoots with that lens well. From memory though I think I remmebr you saying you like to have a wider field than 70mm though ?