>You would be very happy with the 300, I think. I am. It is >12.3MP, by the way. Also has improved dynamic range over the >200. It has done everything I have needed it to do.
I have a D200 and it is an awesome camera... But if I was to replace it I would do the D300 which is even more awesome especially as I can shoot tethered to Lightroom with it. The other slight tweaks make it a better choice.