Let me preface by saying that I know very little about photography (but a lot about aquariums). I'm looking to buy an underwater camera for my significant other, who is an extremely talented salt-water aquariumist and photographer. He has several high quality cameras and lenses for non-underwater photos. He's also an excellent product researcher, which I'm unfortunately not all that good with.
I want to make sure I get him everything he needs to start taking pictures right away (without having to go out an buy more before even getting to try it!) that takes high quality pictures, but that doesn't break the bank too much (though I wish I could get him the greatest of everything). Price range is, unfortunately, only around $400.
While one day I hope we can snorkel and scuba-dive, this gift is for our 92-gallon aquarium (a bowfront glass makes it hard to take photos from the outside).
What would you recommend I buy...a "full starter's kit," you might say?
Note: I'm also considering just getting him an underwater casing for one of his existing cameras, but I'm terrified of him dunking a camera not intended for underwater use!