by the way, nexus, how do we negotiate with Dell?
coz recently i bought online but they never call me.
some people said that before they deliver, dell customer service will call the buyer to confirm on the package?

Chat button.
Dell website:
"Live Chat
our Dell Expert
Mon - Fri : 9am to 7pm
Sat: 9am to 3pm
Sun: Closed "

Don't you ever wonder for the same Dell model, reseller could sell at the lower price than on Dell website? 
Well, if you just pay the listed price on Dell website, Dell will just say thank you very much

devour sifu is recommending these 
Vostro 5460, i3-3120M + HD 4000@RM1,549[1.54kg], 4GB, 500GB(5400rpm), Ubuntu 12.04, 3 cell; W8SL@RM1,749
Vostro 5460, i5-3230M +Nvidia GT630M@RM1899[1.54kg], 4GB, 500GB(5400rpm), Ubuntu 12.04, 3 cell; W8SL@RM2099

Prices are RSP, negotiable.

Vostro - lighter, the i3 M is slightly more powerful than the i3 ULV in Inspiron 14 (also drain the 48Whr battery faster )
Insprion 14 - more frugal power usage, can opt for 6 cell 65Whr battery for long battery running time (standard spec is 40Whr, but since it is using i3 ULV, still run longer than the Vostro 5460 with i3 M), has 2 RAM slot easier to increase RAM (Vostro 5460 only 1 RAM slot).

But one of your main criteria is good / long warranty support (3 years to cover for your sis study?). If you go for Vostro 5460, may not have budget left to extend warranty (defeat the purpose of going with Dell )

One more thing, for budget laptop like these, the profit margin for brands are not that high, expect on ~ 10% discount from list price if you negotiate good (Those RM4-5k laptop may get some extremely good deal if negotiate hard enough )

Good to know that you are being smart by bargaining

Mind sharing what is the specs of the 5460 they have offered you? There are many variants

USually its best to opt for warranty extension if you are getting a Dell 

bargain bargain, but make sure the model is "corrected"

FU, last time thye quote me diff spec but same model..... Probably old specs. Lucky i noticed. I let go freebies, buy myself online

I don't mean to be hard on you, so pardon me if I sound that way, ok?

Buddy, you are not negotiating, you are "fishing"
When you go to the negotiation table (figuratively speaking), you must be clear on the position you want.
The other side will offer something to you (their position). Most of the time, it is good for the other party to reveal their cards first. In this case, Dell Sales are throwing freebies at you. But those freebies are not your PRIMARY objective.
What are your objectives?
You want extended warranty to 3 years (important), and larger battery (maybe can compromise), and price below your budget (very important).
So you must state that your position.
Tell them your budget is only RM1.5k. Tell them the e-value code (never go wrong with Dell) . If you extend warranty to 3 years, and opt for larger battery, what is the price you see on screen (probably exceed your budget by RM100++?). Tell them you don't want any of their freebies.
Do we have a deal?

Asking for "best deal" is not a good negotiation tactics. The other party has to GUESS what is "best" for you, and that leads to lots of frustration on both sides