Bali for a week of land based diving followed by a liveaboard in Komodo.
Not sure I know what your first sentence means, but I will keep track of this thread and look into everyone's recommendations. Thanks!
Well, for camera's, the Fuji F80 with a fuji housing takes great pictures. The S90 (have two of them) is also nice, and the Pany already pointed out. The lowest cost would be the Fuji, best video, the Panasonic and best stills, the S90 (but it does not do HD video).
The tray and arms is the thing you mount the camera to if you use a strobe. The tray is what the camera UW housing attaches to, the "arms" are what hold the strobe. If you are just shooting without an extra strobe, then don't need.