Hi all; I recently bought a Canon Digital Rebel XS for my daughter. Pretty decent camera for the money (C$470). Only thing is, for that kind of money, it came with the Canon 18-55mm lens (the NON IS version). I'd like to get her a better lens, and was wondering what you people thought of the Sigma 17-70 mm f2.8-4.5 DC Macro? Is that lens decent quality? Any opinions appreciated. Thanks.