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Sigma 17 - 35mm f/2.8 vs. Tamron 17 - 35 mm f/2.8

I am ordering a Canon DSLR (Rebel XT) finally in the next couple of days and I am trying to decide which brand of this lens to buy.

Sigma 17 - 35mm f/2.8
Tamron 17 - 35mm f/2.8

I can't afford to spend the extra money on the Canon 17-40L right now so I was wondering if anyone has either of these lenses and which would be the better one to buy. Right now I have heard better things about the Tamron but was wanting to get some opinions from people that I know before making a decision like this. Or if you have any other suggestions for lenses I am willing to listen as well.

Thanks for all of your help,