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But they usually aren't ruggedised or waterproof. Some waterproof compact cameras from Canon etc will do decent video nowdays too (full HD with OK optics).

You could look at a Sony or Panasonic system camera. I have Nex 5N, very compact and dSLR quality (same large sensor, good optics).

Read carefully :-) ...

I got a used Sony 60X from Cash Converters for about $100. Crummy optics at 60X but good value for money...