I have now re-processed my image and uploaded to a new folder here:
http://www.flickr.com/photos/johnkazanas/12298145193/
Although due to the exposure levels there is very little in terms of the star colours and the core is slightly over exposed it a good progression in my learning curve I feel in what was my second attempt at this object.
Although I did do a star mark, reducing the star size and playing with layers in CS3 was beneficial.
Very happy now with this camera set up.
Comments welcome.
Clear skies.
John.