Can anyone give me a good recommendation on a new laptop?

I am looking for a good laptop to conduct good usage on Autocad 2012. I want a good HD screen with good specs that can run any 3D programmes smoothly as well.

I was actually looking on Dell XPS but this model only comes in 14 inches (which I think is a little too small). 15 inch is the best size for me.

What laptop is recommended here?


SUMMARY:

1. Preferred brand: any will do. (Do not want much heat exposed)
2. Budget: -
3. Usage: No gaming. Pure Autocad Works with other engineering programmes
4. Preferred laptop screen size: 15"

Additional preferences:
a. HD Screen
b. the audio performance must not be weak
c. must have USB 3.0 port.
d. Good after-sales service
e. Good battery life

Help please....