I don't think there are any gaming hybrid covertibles in the market 
If non-gaming one then perhaps can still consider this:
15.6"
Acer
R7-571-53338G1T, i5-3337U + Intel HD4000+ (1920x1080 IPS; touch)@RM2999[2.4kg], 8GB, 1TB, W8

This is not a dedicated GC, right?

yes. it is not a dedicated GC.

light and skinny laptop, during to space constraint, could not incorporate very good ventilation / cooling system, so if ceteris paribus, then it will obviously run hotter than normal laptop.
That's why most skinny laptop should use ULV CPU and go full SSD

For your old laptop, maybe get a technician to have a look, clean dust from air inlet / outlet and internal cooling fan, reapply thermal paste as well.

You don't need powerful laptop for your usage. Good audio is tricky. Law of physic dictates that laptop speakers suck (need space to generate proper bass). Suggest you go out and listen to real unit to see if they are "good enough" for you 

Asus
K46CB-WX060H, i5-3337U + Nvidia GT740M@RM2199[2kg], 2GB, 750GB, W8, 4-cell, OD

Lenovo
S400, i5-3317U + Intel HD4000 + 24GB mSATA + 500GB(5400rpm)@RM1999[1.8kg], 4GB, W7HB; AMD HD7450M/W8@RM2199
S400T, i5-3337U + AMD HD 7450M@RM1999[1.8kg], 4GB, 500GB, W8

Prices are RSP, negotiable.
Personally, maybe this has a better speakers than those models above:
HP
Envy4-1238TX, i5-3337U + AMD HD8750M@RM2099[Beats][1.75kg], 2GB, 500GB(5400rpm), W8

thinking of buying alienware 14..will be used for heavy-gaming..but curious about its cooling solution..will there be any problems regarding heat? i mean like overheat / system temperature gets ridiculously high..

All notebooks will get hot when under load i.e. gaming. Only those not maintained properly or have malfunctioned cooling systems will overheat and auto-shutdown.
But if you are worried about tempratures, always go for larger notebooks, which in this case, the more common 15 inchers.
15" notebooks have more space for heat dissipation, are relatively cheaper for the specs, and has more workspace, but all at the expense of portability.
So in the end it depends on what you are looking for

The AW 14 is a great choice if you are gaming on the go, but then there are other alternatives as well in this category 

for the same range of price with alienware 14, what are the other alternatives?

AW 14 can be upgraded to near RM10k oh 
Anyway, these are the usual rivals (asssuming you don't want 15"):
13"
The upcoming Illegear 13 with i7-4700MQ + Nvidia GTX765M (further customizable)

14"
Asus G46VW-CZ116H, i7-3630QM + Nvidia GTX660M@RMTBA, 4GB, 1TB, W8

Lenovo Y410p, i7-4700MQ + GT750M(GDDR5)@RM2899, 8GB, 1TB, W8, red backlit, 120w psu, swappable ODD, 2 years warranty

MSI GE40-2OC, i7-4702MQ + Nvidia GTX760M + (1600x900; anti-glare)@RM3999[1.8kg], 8GB, 750GB(7200rpm), W8

AW 14 can be upgraded to near RM10k oh 
Anyway, these are the usual rivals (asssuming you don't want 15"):
13"
The upcoming Illegear 13 with i7-4700MQ + Nvidia GTX765M (further customizable)

14"
Asus G46VW-CZ116H, i7-3630QM + Nvidia GTX660M@RMTBA, 4GB, 1TB, W8

Lenovo Y410p, i7-4700MQ + GT750M(GDDR5)@RM2899, 8GB, 1TB, W8, red backlit, 120w psu, swappable ODD, 2 years warranty

MSI GE40-2OC, i7-4702MQ + Nvidia GTX760M + (1600x900; anti-glare)@RM3999[1.8kg], 8GB, 750GB(7200rpm), W8

Z400 will be a better deal but keep in mind that the thinness of the Z400 can trap heat + back cover is quite hard to disassemble, for cleaning and upgrading purposes.

G46vw price tag at rm 3999

Thanks for that.
It does caught my attention last time, but i prefer a 14" over 15.6" but it is still acceptable to me.
But is it available in Malaysia already? I do not saw any1 selling it when i try to google for it.
Im gonna check out the demo unit to check on the hinge 

after i had tried few times, its apparently very easy for me, but the warranty void sticker very annoying

www.techhypermart.com try visit the site.
still, can consider as hard?
btw, do you have Acer R7 as per requested by forumer above?

Very awkward notebook

not really awkward IMO. it still looks great.

and R7 has its competitor, the samsung ativ q.

yes, ativ Q is better, as the R7 touchpad possition very weird , feel sluggish