One to consider is the Tamron 24-135, it used to be my everyday walkabout lens, until I lent it to Mrs Y. Now it's her everyday walkabout lens and I have great difficulty prising it off her. It was originally designed for use on full frame film bodies, so using it on a dSLR makes use of the sweet spot in the centre of the frame. Good close focus too. Pin sharp at all but wide open on full zoom. Only real down side of this lens is that it's not the smallest or lightest of beasts.
I'd avoid the Sigma 18-125, not a good lens IMHO.
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