Another vote for the 15-85 based on the way I use it (walkaround, all-purpose). Versatility/flexibility are terrific and it is a well built, sharp lens. Every time I use it (it's on the camera the majority of the time), I am reminded what a great performer it is. Based on what I paid for it (used), I feel like I stole something!
I have a Sigma 300 for inside photos (non-flash; grandchildren candids) and the Tamron 70-300 for the times I need some extra reach. Otherwise, the 15-85 is the lens I use. Outside, f/3.5 is more than adequate and I haven't missed a shot. I have never needed more than 15mm for wider shots and adding a flash inside works nicely when required.. 85 is a bit longer than usual for this general range of lens and takes care of being a bit unobtrusive. My wife's 17-50 Tamron is a nice piece of glass, but the 15-85 is just ..... better.
I had looked at the 10-22 ( the specialty lens comment came to mind when I was looking) and similar and also the 16-35, but I am really happy I chose the 15-85. It just does the job anywhere.