RM5550 for B650 is a good price...
anyway i just check that even the shop next to citibank puchong can give the same price which is b550 =rm4500 , b650 rm5500.
for me in still considering , took my wife to Harvey norman and my wife say 50" might be a bit small after she saw the 55" LCD 200 hz.
reason is are house is 22 x 75 , distance between tv n sofa is 22. wat do you guys think? any opinion?

Just managed to get a look at LCD B650 vs Plasma B650 side by side in Ikano just now. In terms of PQ, the plasma is much better than the LCD, especially the black levels.

Anymore advice on whether B550 or B650 or even B450.. I just care about PQ. Does RM 1k justify on enhance feature of B650 than B550. I mean feature like 100Hz Motion Plus rather than 100Hz Motion or Wide Colour Enhancer 3 than Wide Colour Enhancer 2.

I just really need media playback on B650. It's nice to have feature for me..

I think 60Hz is correct input signal. 100Hz is not an input signal.. it a feature which convert 50hz signal to 100hz so the framerate will be double to avoid blurry in fast move image.

bro, this era not CRT monitor anymore no need to pump VGA signal at 80-100Hz.. we just fix the Hz as the standard HDTV frequency.. like 50hz or 60hz..

those 100hz or 240hz is generated by the LCD internal circuitry to the LCD panel.. 

Refresh rates are really not important for plasma due the nature of the refresh.  For plasma the display just need to support 24Hz, 50Hz and 60Hz. For low quality SD feed (Astro) it is better to have 100Hz enabled for fast moving sports (50Hz). But really not necessary

For LCD it is important. They nature of the refresh requires some sort of image processing to enable a smooth picture when the feed is 50 or 60Hz.

just to add, panel refresh (like 100hz) is only part of the story, then you have intra frame motion processing, black frame insert, and also LCD panel response time.. so LCD have to work much harder to achieve what plasma's panel can do easily with 50Hz signal..