Thanks Ellen!!
I'm happy to help!
So, these gears, they are attached to the lens? And give you the ability I'd guess to control the function automatically? On the Arms.... what is the general opinion on length? Which set and size would you recommend for the Tokina?
In my case with my Subal housing, the zoom gear is attached to the lens and I control it by using a knob on the outside of the housing which uses gears which are mated to the zoom gear. Other housings may do the same thing differently. I leave the zoom gear more or less permanently on the lens since it's a bit difficult to put on and off.
For length of the strobe arms for wide angle shooting (i.e. your Tokina 10-17) check out this Wetpixel link:
Wide Angle Strobe Arm Recommended Length
There are also lots of other links out there and maybe others can offer a few that they have found useful. If I find any more that would be especially helpful to you, I'll post them here.
Also, what other "Little things" might I be missing? I'll double check, but I don't remember the need for extensions for either the 60mm or the Tokina.
detailed shopping list....
Camera
Housing
Lens
Gears
Port dome
Arms
Strobe
Cables
TTL converter
What am I missing??? Things are getting toward the budget limit... what else am I missing?
In my own case, using the Subal Dome Port, I did need an extension for the Tokina. Using the Flat Port for the 60mm, no extension was required in my case.
With the 16mm Fisheye and the 10.5 Fisheye lenses, however, I did not need any extensions at all when using those lenses behind the Dome Port.
I would also get a neoprene cover for the Dome Port to protect it when the crew hands it down to you and when you give it to the crew at the end of the dive. It may, of course, come with your Dome Port.
Eventually you may also want to purchase a Focus Light which is, in my case, mounted on top of the housing. This can range from an inexpensive purchase to well over $400 for the top of the line unit. When light is dim and when shooting at night, the lens will often hunt and be unable to lock focus. A focus light makes autofocus possible and many uw photographers use them. Definitely not anything you "need" right now, but it's something you may eventually want to buy.
Hope my comments helped even if they had you worrying about the "empty wallet syndrome". 
Ellen