Video editing - Pinnacle studio can utilise Nvidia CUDA (just make sure you turn on hardware acceleration in option menu).
If you are willing to forgo quad core, there are more choices 
If a model come with 4GB or less RAM standard spec, you could add in more RAM if there is empty RAM slot (4GB ~ RM100, 8GB ~ RM200).

Acer
V5-473PG-54204G50, i5-4200U + Nvidia GT740M +(1366x768;touch)@RM2299, 4GB, 500GB,W8 *no OD

Asus
PRO45VJ-V0047X, i5-3230M + Nvidia GT635M@RM2399[2.4kg], 4GB, 500GB, W7P
K451LB-WX071H, i5-4200U + Nvidia GT740M@RM2199, 4GB, 750GB, W8
S551LB-CJ120H, i5-4200U + Nvidia GT740M@RM2699[2.4kg], 4GB, 750GB, W8, 3-cell

Dell
Inspiron 14R, i5-4200U + Nvidia GT740M@RM1849 [2.32kg], 4GB, 500GB(5400rpm), Linux, 6 cell; W8@RM2049
Inspiron 14R, i7-4500U + Nvidia GT750M (GDDR5) @RM2499[2.32kg], 8GB, 1TB(5400rpm), Ubuntu 12.04 , 6 cell; W8SL@RM2699
Vostro 5470, i5-4200U + Nvidia GT740M@RM2249, 4GB, 500GB(5400rpm), W8, 3-cell
Vostro 5470, i5-4200U + Nvidia GT740M + 32GB mSATA + 500GB(5400rpm) + (1366x768; Touch)@RM2549, 4GB, W8.1, 3-cell

HP
Pavilion 14-N059TX, i5-4200U + Nvidia GT740M@RM1999[2.03kg], 4GB, 750GB, W8

Lenovo
Z400 touch, i5-3230M + Nvidia GT740M + (1366x768, touch)@RM2199, 4GB, 1TB, W8; 2 years warranty
Z510, i5-4200M + Nvidia GT740M@RM2399[2.2kg], 4GB, 1TB, backlit, W8; 2 yrs
Z510, i7-4702MQ + Nvidia GT740M@RM2799[2.2kg], 4GB, 1TB, backlit, W8; 2 yrs (this is the model with Haswell quad core that is closest to your budget)

Toshiba
Satelite L40-AS125XG/B/W, i5-4200U + Nvidia GT740M@RM2299, 2GB, 750GB, W8

Prices are RSP, negotiable.

1. Preferred Brand: Dell
2. Budget: 2-3k
3. Usage: work, stream videos, movie downloads.
4. Preferred laptop/screen size: 15 (bigger the better)

If any other good brands as well can recommend me. I am totally noob with notebooks. Please guide me sifu.

Did a check on my old desktop i5-750 4Gb, CPU maxed out using MATLAB while just 2-2.5Gb use of RAM. Would that suggest go for an i7? or are the i5 that mush faster now?

Thanks

1. Any reputable brand (Windows only)
2. 2.5K
3. Daily study use (assignments, projects), Entertainment (movies)
4. Around 15

Extra:
Easy to be carried around (thin, light), Less heat dissipation, Removable battery, Long battery life, Vibrant display

At least i5, 500Gb Memory and 4Gb RAM

Thank you

Looking for a laptop for my sister

1. Preferred Brand - any brand with good after sale service is a bonus
2. Budget - 1.5k
3. Usage - college works, photoshop
4. Preferred laptop/screen size - light, good battery life, reasonable performance, upgradeable to 8gb ram?

So my not so insentive research has found;-
NP905S3G-K01 | A6 QC 1.4 | 4GB | 128GB | AMD HD8250 | 13.3'' | W8 | WHT / 2YRS | RM1,559 - very light weight 1.5kg i think, dedicated vcard, SSD!, but is AMD any good?
G500s-0944 | i3-3110 | 2GB  | 500GB | NV GT720 2GB | 15.6" | DOS  | FREE WIRELESS MOUSE | RM1,499 - quite light weight, specs reasonable
A550CC-XX308/309/307 | i3-3217 | 4GB | 500GB | NV GT720 2GB | 15.6" | DOS | WHT,GRAY & RED | RM1,559

Or any other recommendation? If i go for the samsung ok not?

Thank you for the reply. 
I always thought that thinner laptop = better thermal profile   
Changed my list:

1. Any reputable brand (Windows only)
2. 2.5K
3. Daily study use (assignments, projects), Entertainment (movies)
4. 13 - 15

Extra:
Thin, Light, OK heat dissipation, Long battery life, OK display

At least 500Gb Memory and 4Gb RAM
Some told me to get at least i5 because i3 are mostly old models, any advice? 

Any laptops that is the nearest to what I'm looking for? Thanks again 

You don't need i5. The latest gen (Haswell) also has i3 CPU.

Dell
Vostro 5470, i3-4010U + Intel HD4400@RM1899, 4GB, 500GB(5400rpm), W8, 3-cell
Vostro 5470, i3-4010U + Intel HD4400 + 32GB mSATA + 500GB(5400rpm) + (1366x768;touch)@RM2149, 4GB, 500GB(5400rpm), W8, 3-cell
Inspiron 14 7000, i5-4200U + Intel HD4400 + 32GB mSATA + 500GB(5400rpm)@RM2699[2.02kg], 6GB(soldered), , W8SL, backlit keyboard, 58Whr, No ODD

Lenovo
S410p, i5-4200U + Intel HD4400M@RM1699[2.1kg], 4GB, 500GB, FreeDOS

Prices are RSP, negotiable.
FreeDOS mean you need to get and install OS yourself.
Use the remaining of your budget, if any, to extend warranty (Dell to 3 years ~ RM250).

Hi..

1. Preferred Brand - asus/dell
2. Budget - rm3k
3. Usage - daily use, word, game,movie downloads
4. Preferred laptop/screen size - light, good battery life, reasonable performance

Tq

Hi..

1. Preferred Brand - asus/dell
2. Budget - rm3k
3. Usage - daily use, word, game,movie downloads
4. Preferred laptop/screen size - light, good battery life, reasonable performance

Tq

that i5-750 desktop CPU is quad core (but only 4 threads), while laptop i5 is only duo core but also 4 threads (hyper-threading).
Don't really has the benchmark to compare i5-750 desktop vs a Haswell mobile (say i5-4200U), but my guess is that they are about even 

Matlab (the newer version, and / or if you use the Parallel Computing Toolbox) can take advantage of multi-core very well.

When you observed the CPU max out, did all 4 core max to 100% or just 1 core? Max out for how long?

Yes all four and they stayed above 85% throughout the simulation (Matrix based optimization in conjunction with ODE). The total simulation is ~3 min, but just ~2min of the heavy part simulation.

1. Preferred Brand: Dell
2. Budget: 2-3k
3. Usage: work, stream videos, movie downloads.
4. Preferred laptop/screen size: 15 (bigger the better)

If any other good brands as well can recommend me. I am totally noob with notebooks. Please guide me sifu.

Hi Guys, I need to know what are the available laptops on the market that has the longest battery life for a FHD display.
1. Preferred Brand
NONE

2. Budget
NONE

3. Usage
[WEB BROWSING]

4. Preferred laptop/screen size
11-15" FHD

Apple MacBooks?