I am now looking at the Stingray and Bluefin. I was told manual white balance is very impt and seems the Stingray cant do the WB easily.
The Bluefin definitely doesn't support the UX10/UX20. Bluefin housings are made for specific cameras, the latest being the Sony SR11/SR12 hard-drive based cameras.
The Stingray accommodates a long list of cameras by having an adjustable camera tray. It is a lot less expensive than the Bluefin, and it offers fewer controls. Although it doesn't have WB, it does have the other necessities: rec/stop, zoom, manual focus, momentary AF, photo/video modes.
Especially if you're just getting into UW video, I would say that the Stingray is a really good choice. It's well-built, supports lots of cameras now, will support new cameras in the future without major modification, and uses the same optics as the Bluefin. The lack of WB is not insignificant, but you will have a lot on your mind at first and WB will not be the most important thing.
In fact, I'd say you are better off putting the extra money (Bluefin - Stingray) toward video lights. With good lights used on a small subject at close range, white balance is not an issue. For all my close-up work I just leave my camera on daylight WB.
I was gg for a videocam that has two types of recording media. thus the Sony Hybrid models.. HDR-UX20E or UX10E. Would you know if the Bluefin fits these models?
Personally I think the DVD-based cameras are a dead-end, even the new AVCHD units. You're better off with HDV on tape, or AVCHD on hard-drive or solid-state. I use a Sony SR12 strictly with Memory Stick. I put an 8GB stick in and get about 1 hour of recording. The memory stick is shock resistant, removable, replaceable, and downloads my footage in less than 10 minutes, nicely split into files. Furthermore, I can review/search clips instantly and can delete the junk right away.
If I did it again I'd have got the SR11 instead of the SR12...only difference is 60GB drive vs 120GB. I don't use the drive for fear of physical shock damaging it, so the extra space in the SR12 is wasted.
All that said, if I may make a final (and admittedly biased) suggestion...have a look the recent posts in the classifieds entitled:
"Light and Motion Stingray HD Housing"
"Sony HDR-SR11 CAMCORDER HD 1080P"
The housing happens to be mine, and is looking for a good home.
Kris
EDIT: Since links were removed, I have clarified the titles of the classifieds I referred to. You'll just have to find them yourself.