My wife did not like my d200 in an ikelite case. First she missed the screen. Now I loved the viewfinder because I really couldn't see the screen clearly but the Nikon has a built in adjustment that allows me to see through the top of my prescription mask. My wife has no such problem. She can easily see and compose on the Olympus 5050's screen.
Typically she holds the camera well out in front of her and composes on the screen. In addition to no live screen on the d200, like most dSLR underwater rigs, is a two handed setup. In many cases my wife shoots with one hand on the camera and the other balencing herself. Se claims that she can get the camera a couple of feet closer to the fish without scaring it that way plus she claims she can get a shot from an angle wher her body just wouldn't fit.
Then she hated the twin 8" UCLS arms holding the Ike Ds-125 and she was simply unable to get the hang of it. She longed for the simple "bendy" are found on digicam strobes like the Reefmaster.
Finally the rig was too big. It was really heavy on land and unsuitable for her to walk into the water in places like Bonaire where shore diving was the norm.
Small, light, automatic, one-handed, easy strobe control was her requirements.
The solution was an Olympus E330 in an Olympus housing with an Ikelite Ds-50 strobe ttl controller and a UCLS tray with a single handle and articulated (bendy) arm. The entire rig weighs only 9 pounds. (The 5050 with an identical arm and INON d180 strobe is about 5 pounds.) The Olympus e330 housing is quite a bit larger than the Olympus 5050 housing but the entire rig is an easy one-handed setup that comes across only slightly larger than the 5050 because the tray and arm is identical.
The e330 has a live screen. My wife can compose on the screen, then shoot with no shutter lag. The add-on ttl board controls the DS50 strobe. Essentially, my wife can shoot as many digicam shooters do now (one-handed), not as most dSLR shooters do (two-handed).
The setup is very good for fish portrates and macro shots. The Zuiko 14-54 lens is a HQ (high quality) lens and much better than the SQ (standard quality) Zukio 14-45. This lens is housed in a flat port to minimize size. For serious macro shots the HQ Zuiko 50mm lens in another port is an alternative.
Wide-angel is another matter. Olympus does make a Zuiko SHQ (Super High Quality) 7-14 which is an incredible lens and is housed in a dome port but this setup would probably require dual strobes. It would take supurb wide angel pictures but would not be a compact, one-handed rig.
Unfortunately, the rig has a dSLR cost. I will post pictures of the rig and the exact cost when I receive the rig and underwater shots in comparison to the Nikon D200 when I return from Bonaire (Labor Day)