I've been shooting with the 14-42mm lens and standard flat port since I got my setup. I tried a wide angle wet lens but wasn't very happy with it, and I've also tried a macro wet lens, but the camera is just will not focus on the macro subjects with the lens completely zoomed out to 42mm, so I've been shooting without the macro lens.
I recently got the Zen dome port for the 14-42/9-18 lenses, and I've been using that with the 14-42mm. I just scored a 9-18mm lens at a good price from ebay. Hopefully I'll get it before the weekend since I'm doing a boat dive in Carmel this weekend.