I don't know if this helps but I am also a long time SLR/DSLR user and an undewater photographer. Mt UW gear (aluminum housing, lense ports, extensions, gears, 2 DSLR bodies, 3 strobes, strobe arms, 3 lenses, O-rings and misc. stuff)take up a Pelican 1610 and a Lowepro roller carry-on case (total weight 84 lbs). I was looking for something similar to your description for an upcoming Grand Canyon river trip that I could also use later as a dive camera. The G9 had been out for a few months and it fit the bill along with it's compact polycarbonate underwater housing.
It shoots RAW, RAW+JPEG, manual exposure, exposure compensation, flash compensation, ISO 80-1600, f/2.8 - 8, 1/1600. It uses a proprietary battery but I shot 600+ RAW+JPEG over 6 days on 2-1/2 batteries. I had 4 available.
I have subsequently used it on a dive trip to Cozumel and have been impressed with it for underwater also. It is causing me to take a hard look at the expense and hassle of travelling with all my DSLR gear. I assume the G10 is pretty close to the G9 since they were released within barely a year.