Good choice. It will keep you going for quite a while! I have a couple of friends who have them and swear by them, one had a D70s before and says the D200 is a more substantial Camera and a good move up from the D70s.
I am on this one as are a few of my friends one of whom runs a youth hostel in Scotland and arranges for members to meet there twice a year on photo shoots here is a link to that page