Wah, don't really need so much budget for your usage
Any 13/14" notebook would be good enough for your usage:
13"
Asus S300CA-C1033H, i5-3317U + Intel HD4000 + (1366x768;touch)@RM2399, 4GB, 500GB, W8

HP [Ultrabook] Envy SpectreXT 13-2215TU, i5-3317U + Intel HD4000 + 128GB SSD@RM2899[1.39kg], 4GB, W8,backlit keyboard
Samsung
[Ultrabook] NP530U3C, i5-3317U + Intel HD4000 + 24GB mSATA + 500GB HDD@RM2699[1.52kg], 4GB, W8
NP530U3C, i3-2377M + Intel HD3000 + 24GB mSATA + 500GB HDD@RM2299, 4GB, W7HB

Sony
[Ultrabook] Vaio SVT13133CVS, i5-3337U + Intel HD4000 + (1366x768; touch) + (24GB SSD + 500GBHDD)@RM2799[1.6kg], 4GB, W8; color: silver; Vaio carrying case
[Ultrabook] Vaio SVT13126CVS, i5-3317U + Intel HD4000 + (1366x768;touch) + 128GB SSD@RM2899[1.66kg], 4GB, W8; color: silver; Vaio carrying case
[Ultrabook] Vaio SVT13136CVS, i5-3337U + Intel HD4000 + (1366x768;touch) + 128GB SSD@RM2999[1.66kg], 4GB, W8; color: silver; Vaio carrying case
14"
Asus [Ultrabook]VivoBook S400CA-CA006H, i5-3317U + Intel HD4000 + 24GB mSATA + 500GB + (1366x768; touch)@RM2299[2kg], 4GB, W8

Dell
Inspiron 14R, i3-4010U + Intel HD4400@RM1549 [2.32kg], 4GB, 500GB(5400rpm), W8 , 4 cell
Inspiron 14R, i3-4010U + Intel HD4400 + (1366x768;touch)@RM1988 [2.32kg], 4GB, 500GB(5400rpm), W8 , 6 cell
Vostro 5460, i5-3337U + Nvidia GT630M + (32GB mSATA SSD + 500GB(5400rpm))@RM2199[1.54kg], 4GB, W8SL, 3 cell

HP
[Ultrabook] Envy4-1111TX, i5-3317U + AMD HD7670M + [32GB mSATA + 500GB(5400rpm)]@RM2599[Beats][1.75kg], 4GB, W8
[Ultrabook] Envy TouchSmart Ultrabook 4-1239TU, i5-3337U + Intel HD4000 + 32GB mSATA + 500GB(5400rpm) + (1366x768; touch)@RM2799[Beats][1.75kg], 4GB, W8

Lenovo
[Ultrabook]S400, i5-3317U + Intel HD4000 + 24GB mSATA + 500GB(5400rpm)@RM1999[1.8kg], 4GB, W7HB; AMD HD7450M/W8@RM2199
[Ultrabook]S400T, i5-3337U + AMD HD 7450M +(1366x768, touch)@RM1999[1.8kg], 4GB, 500GB, W8

Samsung
[Ultrabook]NP530U4C, i3-2377M + Nvidia GT620M + 24GB mSATA + 500GB HDD@RM2499, 4GB, W7HB
[Ultrabook]NP530U4C, i5-3317U + Nvidia GT620M + 24GB mSATA + 1TB HDD@RM2999, 6GB, W7HP

Sony
Vaio SVF14219SGW, i5-3337U + Nvidia GT740M + (1366x768;touch)@RM2699[2.4kg], 4GB, 750GB, W8SL; colors: white/black/pink
Vaio SVF14218SGW, i5-3337U + Nvidia GT740M@RM2399[2.4kg], 4GB, 500GB, W8SL; colors: white/black
SVF14217SG, i3-3227U + Nvidia GT740M + (1366x768; touch)@RM2299, 4GB, 500GB, W8SL; colors:black/white/pink

Toshiba
[Ultrabook] Satellite U940-1001X, i5-3317U + Nvidia GT630M + (32GB mSATA + 640GB HDD)@RM2349[1.7kg], 4GB, W8SL, backlit keyboard, 3 years local warranty (1st year on-site); color: Light blue
Satellite U840t-1013, i5-3337U + Intel HD4000 + (1366x768; touch) + (32GB SSD + 500GB HDD)@RM2999, 4GB, W8SL; 3 years warranty; color: silver

*prices in RRP, negotiable
*use remaining budget to extend warranty to 3 years. And if wanted, upgrade to SSD for those who doesn't have it already

A good CPU, RAM, GPU (if you are doing 3D stuff), and a fast HDD/SSD will help. Your friend's Asus N43SL is slow because of the slow 5400rpm HDD, which can only become slower with time

Budget ultrabooks come with conventional HDD, mid-range ones come with hybrid SSD/HDD, whereas premium ones come with full-fledge SSD. They are meant to be light, thus they are equipped with SSD. The question here is, why are normal notebooks not equipped with SSD?

Yeah, there are ultrabooks with optical drive, Asus K46 for instant. But most do not have it since most people don't use them anyway, so it can be omitted to again, save weight and reduce the notebook dimensions

Not sure whether you are asking for recommendations or asking questions If you need recommendations, please follow the format 

Are you buying in a hurry? If not, you might want to check out what Illegear has to offer for their promotion this time, might be able to get a decent one (13 or 15") at RM3.5k

For AutoCAD (if 3D then you will need a GPU anyway, regardless of whether you want to use it for gaming or not ), its better if you can go for a notebook with a larger/ higher resolutioned screen. So you definitely have to compromise on weight and portability already, especially so if you want performance as well You can't have the best of everything unfortunately
15.6"
Acer
V3-571G-736b8G1T, i7-3630QM + Nvidia GT730M(DDR3) + (1920x1080 IPS) @RM2899[2.6kg], 8GB, 1TB, W8

Dell
Inspiron 15R (Special Edition), i7-3612QM + AMD HD7730M + (1920x1080; anti-glare) + 32GB SSD + 1TB HDD(5400rpm)@RM3199, 8GB, backlit keyboard optional, W8

Lenovo
Ideapad Z580, i7-3612QM + Nvidia GT640M@RM2499, 4GB, 500GB(5400rpm), W7HB, white *if still can find, though I doubt it
Y500, i7-3630QM + Nvidia GT750M(GDDR5) + (1920x1080)@RM2999, 8GB, 1TB, W8, red backlit, swappable ODD, 120w psu, 2 yrs