After having used an old MPK-VX1 (electronics modified for digital camera's) with a TRV120 , which gave me a first go into underwater video (very sturdy combination but rahter heavy to handle above water, underwater very stable and easy), I decided to move up a couple of steps:
Sony TRV-900e 3ccd (to improve image quality)
MPK-DVF4 + close-up lens and red filter (to reduce weight and volume)
2x HVL-80DA - 50 watt each (they came from the VX1)
Quite pleased with the whole set, which is several kilo's/lbs lighter. Got all parts separately on Ebay. Great manoeuvrability and handling under and above water. Only minus: it has no manual white balance settings/switches, so only on auto.
Used it during two trips to Egypt in Sharm and Hurghada and on some 25 dives. No leakage problems, fortunately.
Editing: on HP 9420 laptop with additional external 250Gb harddisk (going to need soon another one, will get a 750 Gb) playing with both Premiere Pro 2 and Ulead Studio 11 plus. The latter has easy clip color correction possibilities, which I have not (yet) found in Premiere, but Premiere has a more professional approach, much like Final Cut Pro.
While editing I recognise a lot of mistakes (e.g. like camera held to high

, clips too short

, lighting wrong :no, ); there must be many more I don't even recognise yet being a beginner. But it's good fun and keeps me more concentrated on marine life than without camera.
Greetings, Vincent