I've never owned this lens so can't comment on the 17-85mm, but I have owned the 28-135mm IS USM which is a great lens and has decent reach. I paired this with a wide angle 17-35mm so the lack of wide angle wasn't a problem.
I just recently upgraded to the 17-55mm f/2.8 IS USM and although expensive, it is an amazing lens! I can't see myself replacing it as long as i'm on a crop body tbh, and i'm now selling both my 28-135mm and 17-35mm lenses as they just aren't needed now. I've also purchased with it a Sigma 10-20mm for ultra wide landscapes, but 17mm is wide enough for general use imo. I will probably invest in a longer reach lens at some point, like a 70-200mm....but as a walkabout lens, if you have the money, the 17-55mm is the best option.