I'm actually thinking about using my D200 for some recreational photography. Maybe enough time has passed for me to get some interest in photo taking, for those of you who know my background. I'm itching for an ultra-wide zoom. I'm sure the Nikon 10-24 would be great, but I'm not wanting to spend quite that much. The Tamron 10-24 seems to have a lot of detractors regarding image quality, which brings me to the Sigma 10-20. Anyone have any personal feedback? BTW, this would go along with a Nikon 18-70 which is kind of my budget, all purpose lens. I also might be looking for something to cover the range over 70mm, since I don't necessarily want to carry around my Micro Nikkor 70-180 because it is a little too specialized and far too valuable to risk it being damaged.