Camera and housing is about $1.3+. The rest are for the arm and strobe. I am in the canon and nikon generation so I have no clue about Ricoh. Need more reasearch.
I do still think S90 to be a safe choice. G11 would have consider if not for the big ass casing.
While I understand the pain in carrying and traveling with a large camera.... your main concern should be the ability of the camera... not so much its size.
Not much divers I know of around SE Asia uses Ricoh camera.... most, like you said, goes for the more common brand like Canon, Nikon, Oly, Fuji... etc. Not saying Ricoh is no good or anything
... just that this brand isn't so well known around here. I would still suggest you stick to the more common brand here.... Canon, Nikon even Oly and Fuji made some very good PnS camera for Scuba. Cost is another thing all together
Are you using the ScubaCam's OEM Arm & Tray on for your current setup?
Yup.... they made some very good OEM arms and tray.... much cheaper than those from Ultralight.
Also part of ScubaCam - http://www.sea-gadget.com/