JohnnyG wrote:
I'm seriously considering selling my 17-85 IS and I'm looking for another walk-around lens. I'm partial to Canon but may be convinced otherwise. Budget is somewhat wide, up to $1000.00 or so considering I'll get $400.00 or so for the 17-85.
I've considered the 17-40 because of what I've heard about it on this site. I'll retain the 17 mm for wide angle and there is the perceived quality of an "L"!
Please give me comments/suggestions of the 17-40 or any other suggested lens for walk-around.
Thanks,
Hmm, the perfect walkaround, why would you throw it out? 
I have a 17-40 but that lens fills a different role and leads a different life..
17-40: You will definitely lose IS and the longer end. I dunno, I like a bit more telephoto on my walkaround zoom, but if you can live with the focal length, the quality is definitely there. The 17-40 on APS-C has definitely got better image quality wide open than the 17-85, especially wide open at 17-24mm.
17-55 f/2.8: awesome lens with awesome specs. Color, contrast, performance all L grade. I am a little put off by the dust problem though.
16-35 f/2.8: L and everything. Even shorter focal length but I have seen wedding professionals use this on a 20D well before the 17-55 f/2.8 came out. I suppose they have their reasons..
24-105/24-70 L zooms: Awesome image quality, awesome performance, everything you want from an L. *NOWHERE* near wide enough on APS-C at least for me. Crop factor turns 'em into 40mm zooms at their widest end. Nope, doesn't work for me. 24-105 lives on 5D.