If your buying Electronics in Hong Kong it can be easy to become overwhelmed by all of the options and let me preface this by saying I love Hong Kong.
General rule of thumb applies here - if it looks too good it probably is. I have been to HK many times and on my most recent trip I wanted a Video camera. I went to one shop who gave me a price on one of the Cameras in the window display of one of the bright neon lit stores you will see, generally in Kowloon around Nathan Road or the Golden Mile.
This is the usual sales routine as I tried it on a couple of them :
