office usage can extend to 2.5-3k?
are you in the art department?

1. Preferred Brand                  - Any brand which gives solid built, good after sales service, extended warranty
2. Budget                              - up to 2.5 - 3.0k
3. Usage                                - office use
4. Preferred laptop/screen size - 14-15 inch

Can consider this one:
14"
Lenovo
(1) ThinkPad Edge E430, i3-3110M + Intel HD4000@RM2299[2.2kg], W7P, 2GB, 500GB (5400rpm), anti-glare
(2) ThinkPad Edge E430, i5-3220M + Intel HD4000@RM2599[2.2kg], W7P/W8, 4GB, 750GB (5400rpm), anti-glare

*Prices in RRP
*For (1), use remaining budget to upgrade the HDD to SSD, and extend warranty to 3 years on-site
  For (2), extend warranty to 3 years on-site (don't think can afford a SSD with the remaining budget) 

You can also take a look at Dell Vostro and Latitude units as well, preferably the latter. But this one you need to deal directly with Dell for specs and price since they are not readily available 

Lenovo's on-site warranty support should be pretty decent, though probably not as good as Dell.
Oh, that's because the Inspiron is a budget-line, consumer notebook haha.
Check out the Latitude series, I'm sure you will be impressed 

We don't have specific details on the models unfortunately, you will have to start from here:
http://www.dell.com/my/business/p/latitude-laptops

Check out the ones under "Business Basics" or "Ultrabook".
You can either check with resellers, or email Dell directly for purchase

I'm not sure why Dell has made it so difficult for normal users to purchase their business-line notebooks. Sorry about that