Personally, I find the 24-x lenses to be too long on crop to be "right". You're probably fine with the 17-55 for that range, plus you get the IS+f/2.8 combo that's still elusive for FF (perhaps there are third-party lenses that offer this...I only look at Canon and Zeiss at this point). 70-200 is a great combo, but perhaps it's worth looking at the 85/1.8, 135/2, and/or perhaps a 35/2IS or 35/1.4II.