MT Shooter wrote:
You have lots of choices, the Canon 18-135mm "kit" lens is a very adequate performer and may have come with your camera if you bought the kit. Look at the Tamron 16-300mm and the Sigma 18-300mm lenses for great range in a single lens. Canons 17-55mm F2.8 is very nice, but you will want to add a second lens like maybe the Canon 70-200mm F4L IS, then you will be carrying two lenses though.
I heartily agree with MT Shooter. I would also add the Canon EF-S 10-22mm and 15-85mm to that list as options. Until about a year ago, I had a 70d and those two were my favorite lens. Also, for less money at the wide end, the 10-18mm is pretty good. I also use the EF 70-300 and 70-200 F4 IS with satisfying results. IMHO, money spent doesn't necessary begat better images for the cropped sensor cameras.