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If you can get the 24-70mm f/2.8L lens used or via import ($1150 in USA), that would be a good choice. New it runs a bit high for your budget, at around $2100 in Australia. It is the lens that spends the most time on my camera, and I also have a Sigma 15-30mm, Canon 100mm f/2.8 macro, and 70-200 f/2.8L. The 24-70 is the most versatile to me for general use, and is very sharp and solidly built.
IMO, IS isn't so necessary in lenses below 100mm focal length, since camera shake will not be as evident. I used to have a shorter Canon lens with IS, but get better shots with the 24-70 just due to it going down to f/2.8 instead. It gathers more light, so the IS is less necessary.
When I first got a DSLR, I made the mistake of getting a Sigma 75-400mm lens. That lens was junk. Sigma build quality varies so much between lenses. To contrast, the 15-30mm I have has a great build. If you are determined to get a sigma lens, make sure you are happy with the quality before buying.
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