KC06 is more neutral, slightly brighter. KC06a more bassy, sounds darker, better ambience.

Need recommendations from sifus

Your rig:
-Laptop and smartphone

What type of usage:
-Mainly music and calls(skype and phone)

File format used in your source:
-MP3

Genre of music you listen to:
-Chinese song(Sorry don't really know the genre,like Jay Chou,Tank and etc),Rock,EDM

Headphone/ earphone type:
-In-Ear Headphone

Other requirements:
-Preferably with mic,can last for long time and noise isolation(normal also can)

Budget:
-Rm100-RM200

I just want to find a pair of in-ear headphone to replace my samsung headphone(HS3303).My headphone are not spoiled just hope that can find a better headphone than this.If you think RM200 is not enough to replace then can also recommend headphone higher than RM200 but just hope that is won't over RM300 budget(preferably RM100-RM200).Any reply from sifus are highly appreciated.Sorry for broken English and my fussiness.

most IEM is not hard to drive, sensitive enough. X1 is sufficient.

Regardless how many RMxxxx, as long the earphone has relatively low impedance (<150) and high-medium sensitivity then it shouldn't be an issue. The only concern is how you are going to pair the combo, like once i paired X3 with my VSonic GR07, it was too warm sounding and out of my taste acceptance. 

If it stretchable why not just go for m50x