Nikon AW100, Olympus TG-1 or Sony TX20?
Have not heard of the other cameras you mentioned but the reviews for the Sony TX20 have been generally positive at http://www.squidoo.com/sony-tx20-review
They say IQ is pretty good for such a tiny camera. BTW, the TX20 is NOT for scuba divers as it is waterproof up to 5m only
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