Luiz:
Thanks for the welcome...its a great site.
As to the flash synch, I understand the concern about high speed synchs and sunbursts. I am more concerned about low light situations. When I shoot film, I typically shoot at 1/60 given that I usually use ASA 100 film. My camera will synch my strobes at this shutter speed. Presumably, if one has to shoot at 1/250 to synch the strobes, I assume you would set the ISO to 400 when shooting digital. However, with my D2X (which I have yet to use underwater), it appears as if I can actually synch at 1/60, allowing me to leave ISO at 100 or 125. I sense this might minimize digital noise, which I take to be an advantage. Am I confused?
As to the focus issue, I understand that this is a function of the lens. However, an earlier member had made a comment which I didn't understand, but as I re-read his comments, I now realize he was discussing the 18-200 lens and its minimal focus depth, not the camera. Obviously, this won't be an issue with the 12-24mm which has a minimal focus distance of 11.8in. My bad !! 
Thanks again,
Aaron