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The Sigma 10-20 is a great lense, but for astrophotography, I think you'll find its too wide, As a wide angle lens for terrestrial photography, for the price it cant be beat.
As I've said in other threads, I couldnt tell you which one is best for astrophotography, as I've never done any dslr astrophoto's (yet)... but as I understand it, if its a canon lens with the letter L and a little red stripe on it, its brilliant (I used to have a 70-200 f/2.8L and a 300mm f/4L)
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