http://photography-on-the.net/forum/...d.php?t=234558
The 17-55 2.8 is not a good lens, it is considerably better than that. It is said it is a L lens without the red ring.
A 10-22 will get very wide but you have to be very careful in using it or the distortion will get you.
http://photography-on-the.net/forum/...10-22&page=340