^Which model you are interested with?

How much budget?
Need good GPU ?

For RM2K+, don't really have notebook with significantly lighter weight + good GPU. Mostly still weight 2.2KG
If you have more budget, can consider the
Sony Vaio SVS13116FGB, i5-3210M + Nvidia GT640M LE@RM3299[1.72kg], 4GB, 640GB(5400rpm), W7HP

or unless you don't mind with slower CPU,
Asus K46CM-WX090V, i5-3317U + Nvidia GT635M@RM2099[2kg], 2GB, 500GB, 4-cell battery, W7HP, OD

Get the Vaio and MOD the GT640M LE to a GT650M DDR3 speed without significant temperature increase.
Then, consider yourself owning a 1.72kg lightweight laptop than can do gaming like the N56VZ.
You can also physically change the GPU mode to Intel/Dedicated by using the Stamina/Speed mode switch.

Someone is selling it at a low price(RM2,500) for a 7 week old Vaio :
http://forum.lowyat.net/index.php?showtopic=2505694&hl=

OR

Get the Acer M5.
[Ultrabook] M5-481TG-53316G12, i5-3317U + Nvidia GT640M LE (28nm Kepler) + 128GB SSD@RM2899[1.85kg], 6GB, W7HP

You won't feel the difference in terms of performance compared to your current one.
Unless you don't care about the performance, then go ahead.
Or just top up and get the :
[Ultrabook] UX32VD-R3001V, i5-3317U + Nvidia GT620M + 24GB mSATA SSD + 500GB HDD@RM2999[1.3kg], 4GB, W7HP, 6-cell battery (6570mAH), 2 years international warranty
Again, that is if you don't mind about the performance.