Gyula... what's the budget?
There are a few cameras shooting 24P now. The Canon HV20 and Sony V1 are progressive sensors. The XH-A/G1 are not progressive sensors but the product is 24P. the question is do you want to live with HDV still?
For example, the Endeavor is about 12kg fully fitted with cameras and batteries. Your Phenom is about 16kg with camera. That's 25% less weight and about 15-20% less bulk. The pelican case,1620 with housing is only 20kg.
The review should be out by next week. You can wait to see if it's worth looking at then.
Well,
the budget could cover the Endeavour with the HD-monitor and the 94 wide angle lens. The size data you provided are one of the biggest reasons to switch. HDV is a good question, I think I simple do not have any other possibilities within this budget - about 10 000 EUR or 14 500 USD. Since I have the big and the small Amphibico Discovery HID lights, it seems to me, it is better if I stay with their housings - in this case Canon is not a choice. However, I would appreciate, if Amphibico would produce a tripod for the housings as well as Gates...
24p is also preferable, however, 60p would be much better, as the HVX200 does, but that setup has its own weight as well...
The G1 or the V1 has the capability to produce 4:2:2, with true HD resolution, HDMI or HD-SDI, which features I could use during topside productions, simple put my mac pro with my existing Kona capture card, or with a blackmagic intensify card next to the dolly or whatever, and capturing the HD-stream during shooting.
I would wait for the XDCAM EX, but I need a setup for the SanDisk Red Sea Shoot-out in this November - however, finally I could rent a gear for those 4-5 days (if I would sold until that date my Z1). However, the XDCAM will be heavier as the Z1 setup...
Anyway, I am currently thinking besides buying a new gear, whether is it better to rent a gear for shooting? I guess this is a good solution - if you have a tight and precise storyboard and you can plan, how many days you need a setup. For every other purpose to buy a cheaper setup would be smarter.
I think to make a storyboard and make memories a HC7 or smaller setup is enough - even for a shootout.
Since I am not always in the water (unfortunately), I try to find the best solution to save some money. I have learnt that the worst investment is when your money is just standing somewhere and do nothing. Teh other side is, when I am in the water I would like to get the best (speaking now about the technical side) from my setup (and myself).
As it seems, I have recently to much time for thinking.... 
So I am eagerly waiting for your report on the Endeavour. The guys at the Amphibico told me, it would be a big backstep for me from the Phenom... Since you had a chance to shoot with much more housings and camcorders than me, I am very curious...