QUOTE(andyliew97 @ Jul 12 2014, 07:39 PM)
1. Preferred Brand:asus,dell,msi
2. Budget: 2.5k
3. Usage: gaming(bf4,lol,dota2,etc...)high graphic game,autocad,photoshop.
4. Preferred laptop/screen size: more big more good

You won't get very "high" gaming at that budget unfortunately
15.6"
Asus
K551LN-XX251H, i5-4200U + Nvidia 840M@RM2299, 4GB, 1TB, W8.1
Lenovo
Z50-70, i5-4210U,Nvidia 840M + (1920x1080)@RM2399, 4GB, 1TB, W8.1, 2 yrs
HP
Pavilion 15-N227TX, i5-4200U + Nvidia 840M@RM1849[2.33kg], 4GB, 500GB, Ubuntu
Pavilion 15-p036TX, i7-4510U + Nvidia 840M@RM2499[BeatsAudio], 8GB, 1TB, freeDOS; W8.1@RM2699
*upgrade to 8GB RAM at least with remaining budget
If you are adventurous, and want the best for your budget, go for the RM1849 HP, install OS yourself, and use remaining budget on a 256GB SSD