advice needed for underwater photography (full frame owners please)

Hi there,

i decided to get an underwater case for my 5d2 as previous attempts with g12 underwater were ok but not stellar. i am looking at ikelite case, i like the fact that i can change the front module to acomodate different lenses, plus 2 flashes.

i am thiking in using the fisheye and 35 1.4, but i wonder if using these lenses is enough.

i'm not dreaming in using the 35 at 1.4 as the focus plane is really small and the water movement is enough to shift it (me), but what lenses are you guys using when shooting underwater?

many thanks for any advice,
Dorin