Don't expect any advice from me! I've never been entirely sure what a
Bigma is - a large
Sigma zoom, I think. Perhaps someone will clarify for me.
I've used
Nikon professionally but never been able to afford one personally (

) but have always worked on the assumption that, if you want the best - get
Nikon. However, lots of people get superb pictures with other set-ups so will be interested to hear of comparisons.
