I have that 17-55mm mentioned above and it is very nice. Because its relatively short focal length and being pretty fast, lacking VR is not really an issue.
In addition to comments above, you will want an extenral flash since the on camera flash will leave a large vignette in the lower center.
For a low teen super wide, I have the 12-24mm constant aperture but there is a newer 10-24mm now which is not constant aperture.
My most recent addition is a 35mm f/1.8. This is a very low cost and fast lens.