All of the smaller point&shoot rangefinder type digital cameras will work fine Alison. There are a few limitations however.
Primarily, the type of camera you are looking at has "shutter lag". This is a short delay between the time you press the shutter and the time the image is captured. The delay is to give the camera time to preflash, focus and snap the image.
The delay is usually only a fraction of a second, but if you are trying to take images of moving fish, that can be very difficult to adjust for.
This is not a reason not to buy the system you are looking at, but you need to be aware of that fact.
An external flash with a long arm is a must, but before you buy, make sure that your camera allows for external flash hook up and that you will either be able to maintain your TTL capabilities or that you are comfortable using manual flash.
A really good place to learn more about underwater housing and lighting is www.wetpixel.com. A great bunch of folks that do nothing but talk about underwater gear.
Good luck and happy diving!
Bob
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