Help choosing a WA lens for a SD-630

[uniqueimaging]

I currently shoot a canon SD-630 in an Ikelite housing, with a sea&sea ys25 strobe.
I love the setup, especially its compactness, and travel-ability.

I'm looking at getting a wide angle lens for this setup, and I'm not sure which way to go.
I am going to use one of the Ikelite adapters, for either Inon, or standard threaded lens.

I am looking for opinions on the Ikelite w-20 lens, The Inon UWL-105AD, or the Inon UFL-165AD.

I know that the last Inon is a fisheye, and that doesn't really bother me. I use a fisheye on my dslr above ground all the time, and love it.

Does anyone use and of these lenses and have anything to say (good or bad) about any of them?

Any help would be appreciated!

Thanks,
-Mike