Originally Posted by andnowimbroke
Well, giving this some more thought, how happy are you with the Tamron 28-75mm f/2.8? I ask because there wouldn't seem much point in keeping that lens if you get the EF-S 17-55mm - the 17-55mm has same f/2.8 aperture, has IS, and you won't miss 20mm on the long end, especially since you have the 70-200mm f/2.8L IS, but 11mm on the wide end is a significant difference.
So IMO, if you get the EF-S 17-55mm you should be looking to sell the Tamron 28-75mm. But, if you're happy with the Tamron as a general purpose zoom, have you considered theEF-S 10-22mm f/3.5-4.5 USM Lens? It's a true UWA lens for 1.6x bodies (16-35mm FF equivalent). Build and IQ are excellent (on par with the 17-55mm, although it's a much lighter lens).
Having said that, I think the best two-lens combination for a 1.6x body is the 17-55mm f/2.8 IS + 70-200mm f/2.8 IS.
--John
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