A marketplace favorite is the Canon PowerShot A640 (2.5″ screen; 35-140mm F2.8-4.1; should be responsive); WP-DC8 should be the SCUBA case. For my part I don’t like the Canon PowerShot A6xx cameras for the following reasons:

(1) It uses four AA batteries, which typically last for only 50 pictures (you can go out and buy four rechargeable NimH batteries, but these are even heavier than the regular batteries),

(2) the A6xxx cameras have a record/play switch (if you are going through photos that you’ve already taken and something interesting catches your eye, pressing the shutter release does nothing–you must first remember to switch the camera from playback to record mode)

Another great camera is the Canon PowerShot A710 IS; it’s chunky but has a useful image-stabilizer for low-light photography; 35-210mm (equiv.) lens