sorry dude, just went the Nikon way few days ago, can't help
:bah:
check out this page, some good reviews and rating for lenses.
http://www.fredmiranda.com/reviews/index.php
edit:
Canon EF 17-40mm f/4L USM
seems to be very popular, 337 reviews, rating 8.9/10
Canon EF-S 10-22mm f/3.5-4.5 USM 137 reviews, rating 9.0 /10