Charlie, I'd really appreciate your feedback. After I posted above, I found the camera with housing for a little bit cheaper at B&H Photo. I've had good luck with stuff I've ordered from them before, so I'll likely order from them.
I'm scheduled to dive in the Bahamas starting 19 June and B&H says it takes about 2 weeks for delivery. So if you could get us your feedback before the end of May, that would be fantastic!
And re your comment about being a rookie: I hear ya! I started taking photos back in 2001 - some of them are quite scary to look at now! But you are right that once the camera is in the case and you're down below, you MUST know the main buttons and what to do. When I get a new set-up, I practice with the camera inside the case on land first for at least 15 minutes. Then - if I have access to a swimming pool (or even my sister's hot tub!) - I do it there, too. That way, when I hit the ocean I'm pretty comfortable.
One suggestion: the housing comes with this stupid wrist strap - worthless. You should have a spiral thingy that clips to your BCD (sorry, don't know the name, but your LDS will have one). That way, you're free to let the camera go without fear of losing it if you suddenly need both hands.
Have a great trip!
Trish