Hey mate,
Thanks for the reply.
I know that there are other zoom lenses that have a constant aperture of 2.8 but none of them seem to be quite as highly rated. I know that the Nikon 24-70 is expensive but I would rather spend a bit and get as good a lens as I can. I have seen them on ebay for around $1,700 - $1,800. I'll see how I go though