Info on digital camera characteristics for scuba diving

Hy,
this saturday with a friend of mine we had an immersion at Tor paterno,
near Rome,
It was two year that we don't have scuba diving, last time was in Sharm
in 2004, Raskati and Shark & Jolanda,

Now I would want to buy a digital photo camera, have you any idea of
which one is the best at the moment for diving application ??

I'm interestetd also to know the following:

1) Which zoom is the best suitable for diving, 10x or there are problem
wih the focus ??

2) It is a good idea to buy a camera with high iso, maybe 1600 or 3200
to avoid usage of lamp ?? Which iso is best fitted ??


Many thanks,


Antonio
www.etantonio.it/en/sport/diving/