Selecting a processor can be difficult.
What you need today may be not what you need tomorrow.
Newer programs, games and applications come out every day that require larger processors with more power to make them work properly.
It is hard to see what will come out next year, or the year after or even three years down the track, so don’t sell yourself short.
Generally the larger the processor that you select the longer the computer will last.
The "K" Processor allows you to over clock the speed of the CPU, basically rev it harder to get better performance.
NB. It is very easy to upgrade other components of a computer like Ram, Hard Disk and Video Card but not so easy to upgrade the CPU.