tb wrote:
One lens you might consider is the Sigma 30mm 1.8. This lens is almost permanently mounted on one of my bodies.
30mm isn't terribly wide and some people dislike primes, but the price is right and the build quality is good.
This is an excellent lens for sure. I feel the same way about my 35mm AFS 1.8 but then I do like primes. This lens has been attached to my D1X for about 3 months now and it produces BEAUTIFUL shots. Before this lens I loved my 50 1.8 but now that hardly ever gets used.
Right now my wider range kit consists of the 18-55 VR and the 35 and 50 1.8 primes. Fairly inexpensive kit that produces great shots on my full range of Nikon DSLRs (D40, D70, D1X).
If you are dead set on one of the pro level lenses expect to pay out the nose for a good wide zoom and expect some of those to have distortion. You can normally buy a whole stack of primes in a wide variety of ranges for what you would pay for a good pro wide zoom. You will have more lenses to choose from however you will most often get better results than all but the best of the zooms.
Oh also if you order from KEH (I get quite a bit of gear from them) make sure you test it FULLY right when you get it in a variety of conditions and settings to insure there are no issues. They are good about returns though they can take some time.