Hoho you are in luck
11.6"
Apple
MacBookAir 11", i5-4260U + Intel HD5000 + 128GB SSD@RM2899[1.08kg], 4GB, backlit keyboard, Mac OSX
MacBookAir 11", i5-4260U + Intel HD5000 + 256GB SSD@RM3499[1.08kg], 4GB, backlit keyboard, Mac OSX

Dell
XPS 11, i3-4020Y + Intel HD4200 + (2560x1440; touch) + 80GB mSATA SSD@RM3899 [1.13kg], 4GB, W8.1SL
XPS 11, i5-4210Y + Intel HD4200 + (2560x1440; touch) + 128GB SSD@RM4299 [1.13kg], 4GB, W8.1SL

Lenovo
Yoga 11s, i5-4210Y + Intel HD4200 + 256GB SSD + (1366x768 IPS; touch)@RM3499[1.19kg], 8GB, W8.1, 2 yrs
Miix 2, i5-4202Y + Intel HD + 128GB SSD + (1920x1080 IPS; touch)@RM2999[800g tablet], 4GB, W8.1

12"
Dell XPS12, i5-4200U + Intel HD4400 + 128GB SSD + (1920x1080;touch)@RM3999[1.52kg], 4GB, W8SL, backlit, spill resistant keyboard, build-in battery, no ODD

However, 11-12" notebooks might be relatively more expensive and perhaps too small (especially those with insanely high resolutions
I personally think 13" notebooks are better in terms of ergonomics and viewing pleasure, yet still not too heavy:

13"
Apple
MacBookAir 13", i5-4260U + Intel HD5000 + 128GB SSD + (1440x900)@RM3199[1.35kg], 4GB, backlit keyboard, Mac OSX
MacBookAir 13", i5-4260U + Intel HD5000 + 256GB SSD + (1440x900)@RM3799[1.35kg], 4GB, backlit keyboard, Mac OSX

Dell
XPS13, i5-4200U + Intel HD4400 + 128GB SSD + (1920x1080; Touch)@RM3999[1.37kg], 8GB, W8.1, backlit, 55Whr

Lenovo
Yoga 2 pro, i5-4210U + Intel HD4400 + 128GB SSD + (3200x1800 IPS; touch)@RM3899[1.39kg], 8GB, W8.1, 2 yrs
Yoga 2-13, i5-4200U + Intel HD4400 + (1920x1080 IPS; touch) + 16GB SSHD + 500GB HDD@RM2999, 8GB, 2 years; colors: grey/orange

Sony
Vaio SVD13236PG, i7-4500U + Intel HD4400 + (1920x1080 ;touch) + 256GB SSD@RM3499[1.33kg], 8GB, W8SL

**Not all specs fit your requirements (especially SSD)
*Prices in RRP
It will be good to opt for warranty extensions for expensive ultrabooks such as these, as they can be expensive to repair

If you don't mind using Mac OSX, then the MBA13 (RM3.2k variant) will be the perfect pick. Use remaining budget to upgrade to 8GB RAM, and extend warranty to 3 years (~RM800) for peace of mind.

As for a Windows system, I will definitely take the XPS13, bargain or dig until I can get one with 3 years warranty ... but I'm biased, so don't take my word for it Try out the systems for yourself, one of the biggest problems with thin and light notebooks such as these are the shallow keyboards (will feel pain after prolonged usage), and the Mac and XPS 12/13 series have some of the best KB out there 

Just my 2 cents