Thanks guys! Any idea with the distortion & vignetting issue of the 24-105 on a cropped frame body? Is it as bad in the full frame body? Would the 10-22 & 24-70 much better or 10-22 & 24-105? I like the IS because it really helps in camera shake and I don't know if canon will ever put IS on the 24-70. I find the IS more relevant to me than the f2.8, having said that I would like to have a lens with fixed 2.8 aperture.