Moving fm film to digital

[DiverLS]

I've been shooting u/w film pics for about 8 years and some people think I'm good. I've been shooting a Sea N Sea MMIIEX w/double strobe, 20mm wide angle or 1:2 macro. I have one strobe (slave) that I can use on a new set up. Can anyone recomment a digital set up that won't take me years to pay off?:06:

Just to show you what I'm looking for, I've attached my best kelp shot.

By the way - I'm looking for suggestions on a housed camera - I want to shoot digital on land too.