That's a good suggestion, and I have actually been restricting myself to 24mm and up on my 17-85 for the past couple of days. So far I haven't missed it, but it's always hard to try and predict when I might need it. The 18-135 is an interesting option, but I would like to stay at or above the IQ I have with the 17-85 and I really want the USM focusing. I tend to use Servo focusing these days to track the kids and that's one of the best features on the 17-85 that I already have.
Maybe I'll see if I can borrow my father's 24-70 for a week or so to see how the 24mm end works for me. I hate to borrow that lens because I know I will want it ....
The other option is lensrentals.com, for not too much you can rent out a 24-70 for a week or a 24-105 and try it out 


