thanks for the replies.
i've already read the lens reviews. the 17-55 tempts me because of it's f2.8 through all the zoom range. I would need a lens who manage to shoot well in low light conditions, as well as helping the camera to focus easily in the same low light conditions. i'm not a really big fan of flashlites
. the price is scarring though. it's big and heavy because is a lot of glass. the optic quality, close to the L series lenses, really atracts me too.
the 17-85 covers more zoom as you've said, it's cheaper but only f4 max at wide angle, the optic quality isn't as high as the 17-55.
overall it's a hard desition, it's like a Shakesperean question: "To be, or not to be, that is the question". is it worth the investement for the 17-55 or should i stick with the 17-85?