If you are truly trying to research an article or lecture, there is little to be gained by using demeaning phrases like "monkeying around" to describe the system that the vast majority on this list are using.
The number of digital camera and housing combinations on the market that will accept a hard-wired connection of any kind (TTL or not) is limited. The Nikon pro-sumers, the Tetra housing for Olympus, the Titan for Olympus E-20, and the couple of digital SLR's that have housings available are the only ones that come to mind.
Unlike a certain marine engineer I argue with from time to time, most of us don't want to trade rigs every 2 months. Either because we can't afford it or because we have just become accustomed to the rig we are using. This would limit the range of available hard-wired options even further, because many of them have only been on the market for a few weeks.
None of the hard-wired strobe systems would fall into the category of an "economical" system. There are cost considerations when choosing all three components, camera, housing and strobe. You will pay more for a camera that has a flash sync port. You will also pay more for a housing that has a sync port. Only in the strobe is there a break. Depending on your previous two choices, you might get away with an older generation strobe. But, this will not likely overcome the increased costs of the other two components.
Why do I "monkey around" with a fiber optic slave strobe? Four reasons:
1) It works.
2) It was the best option available for the camera and housing I had when I made the decision.
3) I have not seen anything out there to change my mind.
4) No cable to flood or o-ring to worry about.