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Chris,
From the viewpoint of photographing weddings, IS is a must in dimly lit churches and indoor events.
Having said that, I use my 200mm f/2.8L prime that doesn't have IS, for the formal portaits after the ceremony and every shot is crisp! Even in late afternoon shots, at f/2.8-f/5.6.
If you can afford the IS version of the 70-200, get it (there's a fair amount of premium over the non-IS version). Ultimately, just bear in mind that it is a heavy beast, and, your final decision will rest on what you wish to photograph.
Regards,
Humayun
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