Thank you all for the input.
The comparison link is great and helped me a lot, thanks nikonfreak
As for some of the things listed in the link here are my thoughts so far.
Im not bothered about movie ability as I wont use the camera for that (will be getting a dedicated HD camcorder.)
Same comment for video AF and continuous focus whilst filming
Lower noise at higher ISO seems compelling (Although it looks like either camera will be an improvement over the D200)
The comments on better image quality and colour depth always strike me as being subjective and not understanding any science behind any comparison I struggle to quantify and rationalise in my thoughts.
Cheaper - always a bonus
Smaller and lighter - doesnt really bother me all too much as I plan to get a vertical grip and the camera is rather sizeable anyway (when looking at other cameras around)
I think the issue of weatherproofing and ruggedness is important to me as I like to be confident in my kit. That isn't to say I throw it about but I like to be confident it will take a knock and I guess travelling to NZ could see some relatively harsh environments.
@Bob, thanks for the congrats. I guess on the face of it the D300s should seem like an automatic upgrade from the D200 but this is why I am struggling.
Having looked at the cameras and the issue of ergonomics the D300s appears to have a similar (if not the same) layout as the D200 thus I should find the switch to this easier than the D7000 which appears to have a different layout.
Using CF cards is good as I already have a stock of cards however to switch to SD wont add too much cost (I guess I would need to get a stock of SD's anyway)
Jumping from 10mp to 16mp sounds great and I can see the benefit but I must admit using 10mp has seen me alright to date and Ive made some relatively large prints.
I guess its a close call between cameras and I also guess I have a slight stigma towards the D7000 due to the layout of the controls and the layout of the top dial compared to what my D200 has and what the D300s would have.
@Razvan - there have been rumours about the D400 running back to 2008, the latest rumour was for it to be released in the first half of this year - well thats been and gone!
Oh dear, I thought I was getting close to a decision....not quite sure now!