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I start with a housing I like and work backward to the camera. Current is a Sony PC120 in an Ikelite housing. Ikelites run USD 1000-1500. There web site will tell which models they support.
Ikelites are mechanical, so you can't swap cameras. The controls won't match up. That's why I keep using an out of date camcorder.
That said, try the housing. If it works for you, then get the camera.