Originally posted by Mitsu3000gt
How about a Sigma 17-70 2.8-4.0 OS?
The Canon 18-135 is OK but it's very much an entry level lens. Not much better than your 18-55, just with more range. The main problem you're going to find on most of the zoom lenses in the under $500 bracket is that they are very slow on the long end (f5.6). Also, 18MP is pretty hard on entry level glass.
In that price range you basically have to choose speed & quality, or lots of "zoom" - you can't have both.
A Sigma 17-50 or Tamron 17-50 would be nice choices as well, and you get stabilized f2.8, but they are slightly over budget.
You might try looking used as well.
not the Sigma but Tamron non-VC should fit the budget.
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