I have been researching quite a bit and am ready to pull the trigger on a sigma 18-50 f/2.8. It gets good reviews and can be had for about $420 new. Also, check out the new Tamron 17-50 f/2.8 VC which goes for around $650 I think. I have never done a wedding but from what I understand, you wont find 1 "do-all" lens for low light. however, an 18-50 f/2.8 would be a nice pair with a 70-200 f/2.8, then you have a good range with only a slight gap in there and that can be covered by a few steps.
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