Sat 22-Dec-12 09:57 PM | edited Sat 22-Dec-12 09:59 PM by Bravozulu
This comment bypasses the lines of thinking presented so far. More than just the focal length, you really should consider the wide-open f-stop.
I was rummaging around here on this forum and asking questions about the Nikon 24-120 a month ago. There were 3 models of the 24-120 made by Nikon. The last one being AF-S and f4 and VRII.. The middle one, an AF-S f3.5-5.6 is not recommended because of poor image quality. Even though it has VR.
The earliest version however has great optics. My local camera store has one in stock for sale at $125. I thought, "Why not?" So I gook my D7000 body there and asked to try the lens. I went out on the sidewalk and shot a bunch of shots indoors. Some with pop-up flash and some at higher ISO and a slow shutter speed.
I looked at the images on my computer when I got home. Big disappointment. It just doesn't gather in enough light. So the f2.8 on the 24-70 would offer a big advantage for you. I also realized that my 16-85 lens gives me more on the wide-end, and offsets having a reach of 120mm, not a FOV I gravitate towards anyway. In my film days, I had about 8 or so lenses. 180 and 200mm lengths (same as 120 on a DX) just weren't useful to me.