My first rig was a Ikelite Rig for a Nikon D90 and i had one DS125.
I bought it and could not use it for a couple of months, when i tried it first time strobe was dead.
After some emails with Ikelite it seemd that strobe lamp was dead and i had to ship it back on my expenses from Costa Rica to US and then repaired back to Roatan.
The whole shipping added about 300+ on the bill.... After the strobe was working fine, just very bulky and heavy plus you need a charger to charge the battery pack.
I switched to INON Z-240 and never looked back,
- perfect quality, some of my strobes have hundred of dives
- fiber optic cables, no corrosion, no expensive cables, you can buy bulk fiber optic cable and run long distance between camera and strobe,
- use normal AAA batteries, rechargeable batteries work just fine
- perfect automatic TTL working perfectly with every camera i had (d90/D7000/D800/Fuju E900/Canon G11/G12/GX1/Panasonic LX-100)
- you are able to remote trigger the strobes on a certain distance, you just need that the optic sensor is looking towards the camera with the main strobe,
this avoids that you have to run electric/optical cables all around the cave
In your case for cave lighting you may better use very strong video light as it makes positioning much more comfortable as you can place them much quicker
and this will avoid to stir up sediments while doing try and error to find the right position. Basically the same why you use fixed lights in studios.
Very wide and even spread video lights are the 8000 lumen Keldane, expensive beasts but worth every penny.
My buddy does UW video and has two of them and when we dive in the caverns they illuminate very well!
You can see some pictures shot with twin Z-240 on arms and without any planning, putting more effort on them lighting the pictures would be much better,
but i made them while diving with clients and that limits the time i can invest in finding the right strobe position.