If you need wider than 24mm, get the 17-40 f/4. If you don't, but need faster than f/4, get the Tamron 24-70. Otherwise I would, like so many others have done, recommend the 24-105. User experience around here suggests there's some variation among them in terms of sharpness. I can't comment on that - all I can say is that the two I've tried (rented one, then bought one) are both sharp; both perform superbly even in very low light on FF (I have 5DII & 6D; at least with non-moving things, IS more than makes up for the difference between f/4 and f/2.
; 105 is much more useful than 70; so I think it's a bargain for what it is, even when not acquired as part of a kit.
(I've also tried two copies of the Tamron 24-70; I rented one, then bought one, but neither was any sharper than my 24-105, and the results I got in low light with it at f/2.8 or otherwise weren't any better than I get with my 24-105 at f/4 or otherwise. So although it's clearly a very good lens, I returned it because it added nothing useful to me.)
PS - it's not clear why you found Mt Spokane's comments unhelpful - seems to me they were spot on.