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The Sigma 17-70mm DC HSM OS lens isn't the best in my opinion, I may have a lemon which is not unknown but you have to work it quite hard both in the field and in post-production to get good results. As you say you want to stick with Canon so the 17-85 or 15-85 EFS lenses are probably the best option. I use a crop sensor camera (60d) but I wouldn't purchase another EFS lens unless Canon come out with the L equivalent, even then I doubt it.
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