Dell's performance is better, both CPU and GPU-wise.
Dell's warranty support is also better i.e. on-site repairs; provided you're covered, of course
go for the 15R, and extend the warranty to 3 years, don't forget to bargain yo, you'll probably be able to get discounts of around RM100 if you're good 

Try http://configure.ap.dell.com/dellstore/con...ron-14r-se-7420 or http://www.dell.com/my/p/inspiron-14r-se-7...ron-14r-se-7420

Any computer shop? Digital Mall? Lowyat Plaza?

Or you can PM one of our LYN forummers hikari85 or devour. They are trustable sellers.

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Added on June 12, 2012, 4:41 pm

It depends whether you want a 14" or 15". 14" for a little more portability and 15" for larger screen (easier to see?  )

The difference is not that much. Just improved graphics, faster, less power consumption, etc.

No these are the only new and powerful ones in the market.
But the time given should be enough to get the laptops.

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Added on June 12, 2012, 5:14 pm
I've already mentioned on SB and IB i5. Of course having a newer technology (IB) will be better than the old (SB).

For me, I would choose the Dell Inspiron 14R SE.

You don't really need such high end laptops based on the stated usage of the girl
But based on all the 3 models you've mentioned, I'd pick the 14R even though its more expensive. The smaller size will be more convenient for girls to carry (in fact, most girls will already say that 14" is too big )... and not to mention the top notch Dell warranty would be very nice to have too~
Like what PhungTM has mentioned, try waiting if you can because the current laptops will eventually be switched to IB later on. I'm sure you don't wanna pay the same price for older specs right?

Where do u get so many models?