I agree with Inkista entirely about the need for the IS being dependant upon what you are shooting. Light is only one factor to consider; subject motion is another. If it is portraiture or still life, the IS won't be as important. If it's for indoor sports, it will be invaluable.
For what it is worth, I bought the 17-50 Tamron 2.8 about a year ago, and it is a great all-around lens for indoor/outdoor family photos, indoor stills, outdoor landcapes... I have enjoyed it immensely. --ds
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