Digital cameras/housings

I have been a diver for over 25 years and am just now getting interested in underwater photography. What I am asking is what should I look for in a camera and housing? I have had a Sealife which does not seem to give me that great a picture. What has interesteded me is having a camera I can use on top and then place in a housing and take down with me. For some reason I have gotten stuck on the Nikon 5000 with an Ikelite housing. Being new to digital photography from the start, I thought this mught be going a little over board. I do not want to stair step up from one camera to another and this seems to be a good setup for the $'s. Does anyone have an opinion?