Yeah, I'd agree with Chris - if you are thinking of the type of images in your post, manual is the way to go. TTL works well with macro - but WA not so much.
If you are looking for strobes though that will do TTL, it's more a case of finding a strobe initiator and which strobes they will work best with on which camera. I'm not so familiar with Ikelite or Canon - but don't Ikelite offer a TTL controller for their DSLR housings? And if so, what strobes does that work with? You could have a look too at the Turtle TTL controller or an UW-Technics. See what strobes they will run from a Canon - and then see which suits you best.
You'll find a lot of the WP crew like Inon strobes - if you do a Search on Inon, Sea and Sea and Retra you'll find loads of useful info.