Hi there...advice please.I love taking photos topside and am keen to get involved in the UW action.I have borrowed a few friends' cameras at times and like digital for sure.I want to buy something lightweight,with not too hefty a housing would be good.Any recommendations?Price isn't a major issue but I don't want to have to take out a big loan!It'll be a piece of equipment I would plan to use for years so I do want to get a good one.Thanks