[momji1971]

Another vote for the glass first. Started out with a Nikon D50 and sigma 70-300mm. Great lens for the price but you will see a marked difference when you step up in the quality of your lens.

The Nikon 300mm F4 prime is a very sharp lens you could pick up with your budget, second hand is cheaper still.

Not sure which way to go for a zoom as I don't own one so will be watching with interest as to what users recommend. How much is the sigma 100-300 second hand?

good luck.
Stu.