Hi Tim,

The 17-40 is a good lens. But you are looking for another. What do you find lacking? Is it focal lengths >40 mm? Is it focal lengths <40 mm? Is it a faster aperture at something other than 50 mm?

If you want a "do it all" general purpose lens for a cropped sensor camera, the 15-85 is a great choice. I enjoyed it for years on my Canon 7D. If you want a little more length, the already mentioned EFS 55-250 STM is getting good reviews optically. There are a lot of choices, but for what you've described so far, the EFS 15-85 is likely one of the best choices.

Good luck,
Brant