Ah yes, the longer this post goes, the lighter my wallet is getting:)
Alex, that's exactly why I was asking. I kind of assumed that as the days wen t on and the sharks got more adjusted, that I would regret not having an ultra wide (weitwinkel).
Karl, I've been looking at the Tokina and Sigma mainly because of price. The only thing of concern would be whether or not the Aquatica zoom gears would fit. I guess I'll have to contact Aquatica unless you or anyone else here know the answer to that.
Joe, from posts I've read on this site, it seems that you have to use a +2 ior +3 diopter.
Many thanks to everyone. This site is awesome and has helped me tremendously.
Later,
Matt