I have an ikelite housing with 3 ports, I really like the housing so I plan on sticking with it. Not to belittle any other manufacturer, but I have not seen any real reason for me to switch, at my level, and being able to see inside the housing is really nice.
I think right now i'm looking at $2500 for an Ikelite housing, camera body, and an Inon flash. (I may buy the Ike 8'' dome and a second Inon flash.)
As long as the viewfinder has a focus screen (d70 does) I think I will be happy there.
A faster sync speed does sound really nice.
I plan on shooting manual focus, I may change my mind but with some of my wide angle shooting, it just seems a better option. (My camera is currently a Nikon POS so the auto focus system may not be the best

)
Thinking about it, the autofucus feature maybe one of the most important aspects for me right now. Blue water shots take forever to get locked in and forget about night shots of open water sharks. If one of the 2 cameras really stand out in this area it would be imporant.
I would love a the D2X but I cant justify the cost right now. If I get better and win a contest or have a photo published then I'll shell out some more money.