anyone any experience of underwater digitals and flash sets? I'm going diving next year and would like a decent camera and flash to get some nice photos of the fish, reef, turtles etc no way I can run to a case for my SLR so I was thinking something like the Sealife DC500 Pro Kit http://www.camerasunderwater.co.uk/d_stills/sealife.html my budget is £500 max