<p>Stefano,<br>
The one I was referring to is 17-55 F2.8 IS. It's one of the best lens for canon crop sensor cameras and 15-85 is also good - definitely better than 18-135 option you are interested in.<br>
So, choosing between the 2 options you have made is a tough call!<br>
But here are some things to consider when making this decision:<br>
a) 70D + 15-85: Great overall camera with video, DPAF, flash triggering, Wifi, etc. Cheaper wide angle options (EF-s lenses)<br>
b) 6D + 24-85: Great low light camera, High ISO capabilities, Wifi, expensive wide angle lenses (but I'm unsure about the 24-85 lens capabilities)<br>
And, for my money I'd want a good overall camera that does everything well including video - so that would be 70D :)<br>
Hope this helps. Cheers!<br>
-RM</p>