I shoot a DC1000. I use multiple 2 GB cards. And change after each dive. That way, if the camera malfunctions or floods, I don't lose the pics I had. I download daily when I'm on dive trips. I use photoshop to clean up my images, but I know people who really like lightroom as well.
You will want to go into your settings and change the pixel setting to the largest, highest it has. Then you will also want to change the resolution setting to super fine. This will save as much data as possible since SeaLife cameras shoot in JPEG which is a compressed format.
I adjusted my exposure value to a negative 2 and I have been so much happier with my pix since then. That change helped to preserve the colors and give me the bluer blues and greener greens that I had been wanting so badly. I got this tip from Cathy Church at Beneath the Sea last year.
I use a duel strobe set up and have been incredibly happy with it. There are pics on my profile that I took with the camera in Mayaguana and Bonaire. The biggest complaint has been the shortness of the arm on the strobe, but that was solved by my awesome hubby for Christmas. I got the ultral-light conversion set up so the arms will be longer and I can still use the SeaLife Strobes.
You will definately want Moisture Munchers and I use the packets and the capsules. The capsules can be "recharged" in a tub of Damp Rid and the packets in the oven. I use the packets in the case and I use the capsules in the housing and inside the strobe back.
Be SURE you inspect the O-ring regularly and clean with a damp lens cloth. Put the cloth over an orange stick and clean the groove as well. A q-tip can leave fibers behind which can lead to a small leak or a flood. I know the manual says to not lube the ring, but I do when I'm on dive trips and I have not had a problem yet. It takes only the tiniest bit of silicone grease.
Hope this helps and happy shooting.