Petie53 wrote in post #17592761
Our 18-135 lives on our 60D for general use. It really is a very useful range on a crop. 18 = 29mm on crop so not really wide. 135 = 216mm on crop. If you go that way get the new STM version. Very reasonable price on eBay.
These comparisons are meaningless to the OP as he only has a crop camera.
The OP wants more reach - there are 15-85 which is an excellent lens and the used prices for it really dropped recently. More reach - 18-135. Even more reach - 18-200. Using a 24-105 on a crop is a kind of an overkill, since it is designed for a FF camera it is big and heavy. Besides, 24 mm is closer to a normal focal distance on a crop than to wide.
Yes, it may be nice to have a constant aperture, but one has to pay for it for longer reach lenses. It is always a trade-off. I chose the 15-85 when I used a crop camera rather than 17-55 for that reason.