Consider a Core 2 Duo, I agree with PJF, there are too many models of Laptops to make any meaningful comparisons.  I which Laptop Manufacturers would stop doing that.  I.B.M is really bad for that.  The I.B.M ThinkPad line an example has Model numbers and SUB-Model numbers.

So as an example they have the T21's all the way to T60+ but than there are the X Series Models as well and than to make things more interesting, each model has a Sub-Model number made up of 3 Digits like AJF, AJC, AKL etc..

Ok I'm don’t with my Rant.

I recommend a Core 2 Duo Processor.   AMD Processors at the moment run to hot and chew up too much power.

Centrino Platform is the opposite.  I have a Centrino Platform Laptop through work and I was very happy at its performance.