............... Can't help you on the wedding question; when I shot weddings we used battery packs that could go the entire weekend and still be used during the week less critical work. You might want to look at a Bolt Cyclone or Quantum Turbo for wedding work. Not only do they provide all-day power, but improved recycle times to deal with blinkers and speed-walkers.
Bolt Cyclone = Cheetah Lithium battery pack plus about US$180 worth of white paint on the case. Given that Edward Tang was mainly responsible for introducing the product to the Western Hemisphere awareness (with just the tiniest bit of help here from Tetrode :lol with other brands playing "Me Too", I can't see any earthly reason for paying nearly double the price for a bit of white paint that adds nothing to the product whatsoever.
Well, then, without so many (more) words, get yourself some eneloops and a La Crosse Technology BC-700 charger. Can't go wrong with these.
Or a MAHA charger...
As good a recommendation as you'll get anywhere, with current (ouch) products.
Nothing actually wrong with the Sanyo Eneloop XX mentioned elsewhere (although you may, I believe, find that XXX refers to something in a different field altogether ). They're nothing special though, in my experience they're piggy-backing on the awesome reputation of the plain vanilla white Eneloop.