Strobe for macro?

I've been out of the UW shooting world for a LONG time. I've got an old IKE Substrobe 150 that I used a lifetime ago with my Nikonos III and 5 when that was state of the art.

I just picked up an Aquatica housing for my old 5D for a song, nice 8" port, macro, ext. rings etc. I can use my IKE manually which is fine, but I'd like to pick up another strobe for macro fill for a trip to Caymans next month. I was looking at an old Nikonos SB105 but I know that is old tech and really has no future and I hate wasting $, even though you can get one SUPER cheap these days. Inon, Sea and Sea, newer Ikelite gear is all foreign to me. Does anyone have suggestions for something I can use for slave strobe now and TTL in the future, or should I just grab an old strobe with slave capability and be happy saving a few $?

The substrobes are great strobes - I started with them after pinching them from my Dad's Nik V setup. As are the SB105s which I have used slaved. You may find with immediate digital review underwater that TTL is less important than it used to be and manual shooting is the way to go.

errberrb...thank you for sharing