Hi guys, I own a Canon 550D with the crummy 18-55mm kit. I've finally decided to upgrade to much better lenses, and I've decided on a tow-lens setup. EF 24-70mm f/2.8L USM EF 17-40mm f/4L USM I'm purposefully avoiding the EF-S lenses for I might consider an upgrade to a full frame when this camera breaks. One thing that stands out is the lack of IS on both lenses. Is it a feature that I'm likely to miss? And what do you guys think about the focal length coverage this setup provides on a crop? Thanks!