Laptop are expensive  The RM2.5k may not buy half the power you enjoy in desktop
Dota2 is not GPU demanding. Anything i5 M should handle your software engineering needs pretty well.

Do you need to carry it around? What is the weight that you can handle?
What is important to you? Nice design? Nice spec? Good warranty support?

So you are young and can carry heavy weight huh?
Laptop speakers are generally not good. Cheap RM100 desktop speakers have better sound
You should know the price of full SSD (128G ~ RM300+/-). Those mSATA (24G/32G) SSD in some of the laptop is factory set for caching, you can't save or install anything on it (won't see it in file explorer) unless you wade into BIOS to change setting.
Even if you buy from your friend's shop, if there were hardware failure, your friend still need to send to SC. Some SC take weeks / months to fix laptop. Consider yourself warned Laptop is unlike desktop, you can't just take out a faulty component but have to send the whole unit to SC.

Asus
A45VS-VX026H, i5-3210M + Nvidia GT645M@RM2199[2.4kg], 2GB, 500GB, W8
N56VZ-S3151H, i5-3210M + Nvidia GT650M@RM2799[2.7kg][B&O], 4GB, 750GB, W8; color: black

Dell
Inspiron 14R (Special Edition), i5-3210M + Nvidia GT640M(28nm Kepler)@RM2049[2.38kg], 4GB, 500GB(7200rpm), W7HP/W8

HP
Envy4-1204TX, i5-3317U + AMD HD8750M@RM2399[Beats][1.75kg], 4GB, 500GB(5400rpm), W8

Lenovo
Z480, i5-3210M + Nvidia GT640M@RM2099, 4GB, 1TB(5400rpm) W8, colors: grey/red/blue
Y400, i7-3630QM + Nvidia GT650M@RM2799, 4GB, 500GB, W8, 120wPSU, swappable ODD
Z500, i5-3230M + Nvidia GT645M @RM2299, 4GB, 1TB, W8; backlit, 2 years warranty (4-cell)

Prices are RSP, negotiable.
For most of the models, you can swap in a full SSD that it's still within your budget
Laptop of 14" and above usually has standard RAM slots for user to upgrade RAM. The HDD bay also is usually accessable for user to swap HDD or SSD.
13" or smaller, depend on model. Some model has fused RAM and no RAM slot. And due to slimness, the HDD / SSD normally is of < 7mm thick.
Again, laptop components are a lot more fragile than desktop counterpart. Lots of things can die on you

For RM2.5k, you can get touch screen.
Acer
M5-481PTG-53316G52, i5-3317U + Nvidia GT640M + 20GB mSATA + 500GB HDD@RM2999, 10-point touch, W8
Lenovo
Z400 touch, i7-3632QM + Nvidia GT645M + (1366x768; touch)@RM2699, 4GB, 1TB, W8; backlit, 2 years warranty
Z500 touch, i5-3230M + Nvidia GT645M + (1366x768; touch)@RM2699, 4GB, 1TB, W8; backlit, 2 years warranty

If you expect stylus input, and still want to play game, NO
Most of the hybrid (Surface Pro is one) only come with HD4000 (or worse) IGPU (unless you want to play in the lowest setting and still with some lag ... )
Acer 11.6"
Iconia W700, i3-2365M + Intel HD3000 + 64GB SSD + (1920x1080; touch)@RM2199, 4GB, W8 (now RM2.6k with keyboard and stylus)
Samsung
ATIV Smart, Z2760 + Intel GMA + (1366x768; touch) + 64GB SSD@RM2499[774g w/o keyboard], 2GB, stylus, W8; color: mystic blue
ATIV Smart Pro, i5-3317U + Intel HD4000 + 128GB SSD + (1920x1080; touch)@RM3599[884g w/o keyboard], 4GB, stylus, W8; color: black