Looking to buy a 3CCD video camera

I'm considering buying a video camera and was thinking about going the 3CCD route. However, I want a very small body, particularly in height (under 4" -- which rules out most of the true mini cams) and weight. So far I have come up with:

the Sony DCR-HC1000

the Panasonic series (GS120, GS200, and GS400)

the Canon Elura 70 (1CCD, but I do like the feel of the Camera)

I'd like any pointers towards housings for these cameras, as well as any feedback about the cameras themselves, particularly for underwater work.

Thanks in advance