Brant, the 17-55 is an amazing lens and the aperture allows you to be very creative with depth of field. So that's the advantage.


This disadvantage is the focal range. If you're willing to give up the 15-16mm I think you cannot go wrong with the 17-55.


You could even sell your 15-85 for an 85mm prime to cover up the gap from 55-100, just a thought [A]


Good luck with whatever choice you make!


Happy Thanksgiving to you too! [](although I have no clue what it is about [:P])


Jan