1. Brand:
Lenovo, Dell, Asus (Unless you can recommend me another barand that has very reasonable specs)

2. Budget:
Not above 3k, the lower the better of course =)

3. Usage:
Engineering softwares like AutoCad doing stuff like 3D modelling

4. Preferred laptop/screen size
Im not picky about the size but generally I dun like too big coz it's too bulky, 14'' is a reasonable size

Please recommend a brand/model that you know to be reliable and durable, my first laptop (Acer Aspire 4740G) snuffed out after 2 years and that seems like a very short time.

All i need i a fast pc that can handle engineering softwares, i dun really care about the other fancy stuffs that come bundled with consumer pcs.

And theres one thing i dun understand, what is the hardware in pcs that receives the wifi signals? and are all these in every pc same in terms of the ability to receive signals?