hi there.im looking for a laptop that can suit my preferences.
i prefer asus because i believe asus is good at handling temp.their ventilation system
but u can also give ur opinion ( like other brand ) and pro/contra
1. Preferred Brand ASUS
2. Budget <2.8k
3. Usage Work + Gaming + Surfing + Streaming
4. Preferred laptop/screen size 14"-15.6"

Hello fellow humanoid of the universe

If you really need to buy now, then the only pick would be the Y580
15.6"
Lenovo Y580, i7-3630QM + Nvidia GTX660M + 1920x1080 @RM2999[JBL], 4GB, 500GB(5400rpm), W7HBasic, backlit keyboard, 2 yrs warranty, P950 headset
Though I would suggest you to wait if you can, new and more powerful laptops will surely be released from time to time..
The upcoming Lenovo Y400/500 are worth waiting for too: http://forum.lowyat.net/topic/2491914

Hard to say since its not officially out yet... there might be changes in specs?
Some more it has ultrabay, that alone will change the performance alot I guess depending on what you put in

1. Preferred Brand - Asus
2. Budget - 1.5k-2.5k
3. Usage - online gaming(such as dragonica)and watch movies 
4. Preferred laptop/screen size - 15'

Any suggestion for my little bro? Currently he is studying at secondary school, there are what he request ><"

As long the laptop can support the graphic game like dragonica , i think it is enough for him ...hope all sifu here can help

off topic: what is FreeDOS?