Hi Jeff...


Wow! It's a coin toss between the 24-105 and the 24-70. The 70-200, though a nice lens, would be too much for your 'schedule' unless you don't mind carrying around almost 10lbs of camera equipment.


My recommendation would lead you to the 24-105 as good friend of mine traveled to China with said lens which saw me sell my 28-135 to purchase the 24-105. It's the perfect weight and size and IQ is awesome though the 24-70 would be more appreciative in the evening due to it's 2.8 aperture and it's amazing IQ as well.


Hope this helps...


[*-)]