Depending on finances, you might want to look at the Canon CP-E4 - its a battery pack that holds 8AA batteries and takes 2/3rds off the recycle time. I just got one, specifically for wedding shooting, and it rocks.
Also, having 8 batteries in it, means you can shoot pretty much a whole day without changing (though recycling slows by the end of the day)
A good investment!
Ben
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