Another thing to consider that if you went with a Zeni min dome it is only designed for the Tokina 10-17mm with the Ikelite setups. If you go with the Ikelite 8 inch dome you can use a huge range of lenses with the addition of suitable extension rings. By looking at that I believe the most versatile dome for your Ikelite would be the 8inch dome and then choose which lens you want to house it.
Honestly if you cant shoot a shark with a 10-17mm as its too far away when its going to be too far away to get any light from your strobes on it. So you might as well shoot strobeless with the Tokina 10-17mm and crop to get the same ordinary dull image ( unless your trying to get a silhouette image).
If your after some sort of general purpose lens which has a large zoom there is the Sigma 17-70mm Macro. It might be suited if you needed that extra reach for far away subjects. I personally found the Sigma 17-70 a pain as it wasnt wide enough when shooting wide angle and macro was useless as you have to shoot the lens behind a larger dome. Every time I used the Sigma for wide angle I wished I had just taken the Tokina 10-17mm out instead. Now the Sigme sits on my desk and never gets used (its for sale if anyone is interested in a Nikon mount).
Why I love the Tokina 10-17mm. It fast to focus. Focuses right up to the dome. and is wide enough to fit most large subjects in so you can get close fill the frame and light the whole subject up.
Here are some shots to show you what the Tokina 10-17mm can do:
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