Portable laptop choice for a physicist?

[vikkipedia]

Hi, I am a norwegian Theoretical Physicist working on string theory

I need to buy a new laptop that's portable and can handle heavy mathematica but it can't be to expensive though i have a budget that's around 1200$, i want it to be around 13"-14".
Please reply as fast you can :)

 

[Greg Bernhardt]

You'll want a Core i7, but you won't find many high powered systems that are 13 or 14 inches.

Here is a nice Core i5 though
http://www.tigerdirect.com/applications/searchtools/item-details.asp?EdpNo=4977870&SRCCODE=WEBAMZP1