If you've decided on digital, I really would look to either Olympus or Canon. Sony just hasn't kept up to speed. It may be a good camera for topside shots but no one has been very impressed with it's results underwater. That's where Oly and Canon have excelled...underwater.
I would suggest either an Oly C-4000 and PT-010 housing or an Oly C-5050 and PT-015 housing. You can get a 5050/15 combo for around $750, depends on your shopping skills. The light sensitive lens and bright internal flash on todays digitals allow you to take great shots without an external strobe. As you practice and get used to how the camera works and how you work with the camera, you can save for a good strobe. That's a whole other subject!!!
I would suggest either an Oly C-4000 and PT-010 housing or an Oly C-5050 and PT-015 housing. You can get a 5050/15 combo for around $750, depends on your shopping skills. The light sensitive lens and bright internal flash on todays digitals allow you to take great shots without an external strobe. As you practice and get used to how the camera works and how you work with the camera, you can save for a good strobe. That's a whole other subject!!!