which of these digital cameras you recommend me ?

Hello,

I have narrowed down the choice of digital cameras to:

Olympus C5050 or C6060

I think the c5050 is no longer available, which one replaces it ?

or

Canon: G3, G5, S50, S60 or A80

I want a good camera for travelling and also good in poor light conditions.

I also want it to have as optional an underwater case when I go diving.

And if possible external flash attachment.

Which of the above cameras you recommend me ?

Any other brand or model you recommend me ?

Thanks,

Mario