Amazon offers the Sigma 17-50mm f/2.8 EX DC OS HSM Lens for Canon, model no. 583101, or Nikon, model no. 583306, for $419 with free shipping. That's tied with our April mention for the Canon lens, $10 under our March mention of the Nikon lens, and the lowest total price we've seen for either with a manufacturer's warranty. (It's a current low by $80 for Canon and by $100 for Nikon.) Features include FLD glass elements, anti-shake, 11" focus, and 1.5x magnification.