I have this one,
http://www.amazon.com/Canon-PowerSho.../dp/B001SER460
3 or 4 trips with it in salt water and no problems yet.
When I was looking for this one, some of the cheaper ones seemed to have reviews that stated they failed after going in salt water.
I'd recommend the D10 for sure.
Edit: Canon seems to have a newer model out, the D20, looks like a better price point for what you get.