Sort of a rhetorical question: any guess as to why Canon's price of the 17-55 has dropped so much? It's only $80 more than the 15-85 now.
I was wondering why myself. I wonder if Canon has a newer updated version on the way?
I have a 15-85mm but I am considering buying a 17-55mm as my low light/indoor lens. I had a prime lens and sold it. I just like the versatility of a zoom, especially indoors.