So, I've had a Nikon D70 for the longest time and I've been drooling over getting a new camera but couldn't afford the $1600 it would cost to get the D200. Well, the D300 came out some time ago and starting in December Amazon.com has been selling the D200 for $799 (Much less than you'd pay for a used D200 up to that point).
So I sprung for it, and have been using it for a few days. It's a huge improvement over the D70 (not just in resolution, 6MP vs 10MP) but in build quality (built like a tank), speed, feel (I can change most settings even when wearing gloves since most controls have their own dedicated switches rather than hunting through menus). The viewfinder (the D70's weakest point) is huge and bright. Also, the screen is bright and easy to see Then to cap it off, I have a slew of old ais lenses I love that will now meter on the D200 (yes!!!!)
I've been very happy. For me, the leap from D70 to D200 has been huge. Yes, the D300 is even better, but given the fact that the D200 is almost half the price of the D300, I saved some money on the D200 body and will spend it on good glass (next purchase, Nikon 17-55 2.8 AFS lens).