Canon EF-S 15-85mm f/3.5-5.6 IS USM Lens
Sigma 17-70mm f/2.8-4 DC Macro OS HSM For Canon
So the Canon can be found for around $600... and the Sigma for about half that at $300... lets assume that the focal length differences at either end are not an issue... What are your thoughts? I know that there is a new version of the Sigma that lists for $499 (I think)... so this question is specifically for the previous version.
I currently have a 24-105mm that I use most of the time, but sometimes find it not wide enough. I was considering either the Sigma or Tamron 17-50mm non-VC/OS... but I have become fond of the IS on the 24-105. I use this lens mostly to shoot my kids indoors. The faster lens would be nice, but am thinking I might like the extra reach of the 17-70 or 15-85.
Thanks in advance for any advice...