Ok, so here's an update on where I am.
I've watched, read and re-watched and re-read the reviews here (BTW excellent reviews as always Gordon
) on both the D7000 and D300s.
The key differences that stand out for me are:
The D7000 doesn't have a flash port thus ruling out studio work. Immediately this doesn't bother me. I would like to start studio work in the future but this wont be for another couple of years or so.
The buffer may not be as good as the D300s i.e. it fires at 6 fps for a couple of seconds and then drops to about 1 fps, whereas the D300s seems to last longer. This initially concerned me as I like to go to air shows. However, thinking about my past experience if I do use the continuous shooting mode its often when the Red Arrows are doing an opposition pass of Gypo split and I vary rarely have the shutter depressed for more than a couple of seconds. Outside of this I dont hardly use continuous shooting so this should be ok. Either camera is going to be an improvement over the D200 and I think the extra fps the D300s offer over the D7000 wont bother me.
The 2 custom modes (U1 and U2) looks like a great addition and something that I think I would use a lot i.e. to have a set of settings for macro work and another set for landscapes looks like a benefit.
Dual card slots is great. Initially I was a bit concerned with switching from CF to SD but I think I was concerned about nothing really. Our HD camcorder uses SD cards so why wouldn't they be suitable for a camera.
I think the fact that the D7000 has fewer focus points than the D300s doesnt concern me. Both have more than my D200 and will be a vast improvement. Looking at how the D7000 seemed to perform in the video reviews looked fine.
100% viewfinder coverage is great.
On top of this I have handled the D7000 and it surprisingly felt ok as I was concerned the button positions would be too foreign to me coming from a D200 but this wasnt the case. It did feel a tad small but I will be adding a vertical grip.
So, all in all, I have decided to get the D7000, save a few pennies and feel confident I have a good camera that will last me a while.
So, alls that left to say it thanks for all the advice and debate and thanks to Gordon for some great reviews.