I had bought Casio Z-1000, my friend had bought Casio Z-850 and S-600 previously.
Advantage: battery saving, light weight and slim, taking movie: quality is quite good, you can continue to record until your SD card memory is full. You can capture the movie into a photo!
Disadvantage: Zoom far distance object, the image would blur.
You can bought in Wing Shing at MK. I had compare the $, It is the cheapest!