Anyone have a Canon S90 camera and use it underwater? I am considering upgrading from my current Canon SD550 point and shoot to the S90 and would love your input. I want to keep my camera outfit small (although I do use a YS-90 strobe) so I do not want to to get a DSLR (just yet anyway). I definitely want something with control over aperture, shutter speed, and ISO and the S90 seems to fit the bill. I would love to get input from anyone on this camera. Thanks.