It actually still is an option. I needed the AF100 for terrestrial shooting,
but I'm seeing that the GH2 is a great option for the underwater work.
I watched the youtube video you sent and it looks great. I do have 2
questions for you:
1. Would the shot be less shaky with a larger housing? (Specifically one made for an AF100)
2. Were you using a Lumix 7-14? If not, what lens and how do you run with full mechanical controls?
All the Best,
You should opted for the DMC-GH2:
Lots of different lenses demoed by this you tube user.