I have heard nothing but amazing things about the 17-55. I have heard very mixed things about the 17-85, and I have been considering selling my 17-85 to fund purchase of the other. I'd like to get some input from the community, yea or nae? I will have a decent gap between 55 and 70mm, does anyone currently have that kind of a gap and find themselves really missing it? Is the picture quality out of the 17-55 really enough to warrant the ~$600 it would cost me to upgrade?
I shoot pretty much everything from portraits to sports to low-light to fast action and everything in between. I have found the 4-5.6 of the 85 to be too slow at times, so the 2.8 has it's appeal. But I am worried that 55mm may not be long enough for the everyday shooting I do and I would be forced to switch lenses quite often.