Tamron 17-50mm 2.8 (which is 27-80mm on a crop)
nice range for travel/walkabout, fast enough for sports (not long enough really thou)
very sharp, comes with a lens hood also (bonus) and at a great price; can be hand new for about $550ish
i travelled the states and it never came off, i'm very impressed with it. take a look on my flickr for some shots.
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