Whats your final output media? Online? Brochures/Catalogs? Pictures to hang on a wall in the office? How much post processing do you wan to do? They all have impacts. The 17-40 is a very nice wide angle especially for the price but it does suffer quite a bit of distortion at the wide end. Need some post processing to get straight lines and such. Most wide angle lenses will be like that some worse than others. If you don't need wider than 24mm, the Canon 24-105 is a very versatile lens and would probably work quite well. For a bit more and a bit higher quality, the 24-70. Another option, depending on what your final product is, is to move to one of the 1" sensor P/S cameras, something like the PowerShot G7 X. Great for online stuff, much more portable, and about the cost of a lens.