hi, bros, i am start making decision to have a high performance laptops, but after went to lowyat survey a few stalls, so blur oredi, dunno listen to who.....pls help me

1. Preferred Brand, some say asus, some say acer.....now i say cincai lar....
2. Budget : around RM3000 - ok
below RM3800 - quite ok....
over RM4000 - out of budget......in this range prefer go for desktop...
3. Usage : 1)graphic editing, Adobe Illustrator drawing large format vector files, rendering a lots of embed files.....
2)photo editing, Adobe Lightroom & Photoshop editing large format photos RAW files, using a lots of customizes brushes , shapes, filters, effects etc......
3)AutoCAD / Sketch up / if the graphic cannot support that high, i will give up on 3D studio max + V ray......it's ok i change sketch-up, more faster....just rendering not nice...
4. Preferred laptop/screen size , must bigger than 13"