Here's artists' guide to buying computers and laptops.
This is not a geeky guide. I'll not be running benchmarks and timing test.
The general trend nowadays is that processing power is generally exceeding software requirement needs. Put simply, it means whatever computer you buy, it should run your software without much problem, unless you're running specialised software, e.g. 3D rendering software.
This guide is to help you optimize your purchase by recommending what you should get depending on the type of work you create.