If you are dissatisfied with your kit lens and desire something better without spending too much money, Sigma's new 17-70mm F2.8-4 DC MACRO OS HSM can be an interesting proposition for you. This new lens cover a useful range for general purpose photography, and the maximum aperture is larger than the typical kit lenses, making this a nice upgrade lens. In addition, Sigma has fitted some nice tech goodies such as Optical Stabilizer and Aspherical glass elements to ensure sharp images (in theory). The Hyper Sonic Motor (HSM) should see the Sigma delivering silent, high-speed autofocus.
With a filter size of 72mm however, buying new filters will not be a cheap affair. In the past, photographers sometimes found their third-party lenses incompatible with their new SLRs because of electronics issues. There's no assurance that the Sigma will be fully compatible with future Canon, Nikon, Sony or Pentax DSLR bodies, but there're programs currently by third-party manufacturers to re-chip the lenses to work with the latest cameras.
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