If you can rent the 2.8 24-70 you will have a bigger range to shoot with. Weddings happen very quickly - small or big and one moment you need 200 and then you need 18. ! No time to change lenses.
My 2c and GOOD luck ! and enjoy
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Tools of the trade :
Nikon chick D700 D200 D70
lenses : 70-200;18-70 50mm 1.4 85mm 1.8 18-200 Flashing chick SB800
macbookpro chick
The chick needs - Nikon 24-70 2.8 ed & nikon 70-200 !

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