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well the SD800 is what i would recommend the most.
canon produces high end lenses with an optical image stabilization system. what they've done is basically incorporated that technology and design into the SD800 IS. also, in all three your getting a 7.1 MP Digic 3 sensor, similar technology to the sensors used in today's most professional canon SLR Camera's.
they all go to an ISO of 1600. ISO is the camera's sensitivity to light rating, the higher the iso the lower light you can shoot in, but bear in mind, as you crank up the ISO, the image has a grainy degredation of quality to it, think of it as when your Television goes snowy, just not as severe.
The SD750, and SD1000 models all have the face detection software as well, whereas the SD800 does not.
the SD800 is considered a wide angle lens, so at 28mm you'll be able to take photos of large groups very easily and it goes to more narrow angles as you zoom in to the 105mm end, not too sure on the lens specs on the other two, i'll look that up.
the SD750 has the largest screen at 3.0 inches. the other two are at 2.5
also, you said you do want to take pics quickly and reduce loading time between images, these are 7.1 MP images, so they are quite large in terms of file size, what i consider a MUST HAVE is a faster memory card, they all take the same format, SD. at costco we sell 2 GB ULTRA II memory cards for your camera for 46.67, which i think is cheaper than most places, if you dont have a membership let me know, i can get one for you. however it only gets faster as there are the EXTREME III cards, but they do go up in price.
hope i was helpful.
p.s. my verdict is the SD800 IS, but i know how good canon's optical IS can be, and im biased as i'll always lean towards that, otherwise, the other two boil down to personal preference, they'll all take a great picture.
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They're all crazy. Even you. You're all...crazy."
"Even me?" she said.
I thought, "Oh right, if I categorically eliminate all other people, it's just me and her. She'd like that.
"Especially you" I said.
"You are virtually the ring leader, the way I see it."
Then, I blew out the candle.
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