Building your own computer can be very time consuming and rewarding at the same time. While piecing the new hardware together is usually a relatively easy task, picking out the right components in the first place is what can make it more troublesome (that's where our PC buying guide comes in handy - but please, read on).The first component that must be decided upon before any build takes place is the processor, as this will dictate which motherboardcan be used and often the memory type. As one of the more expensive components you must choose wisely, so think about the purpose of your build and budget. Popular CPU choices often range between $100 and $200, and surprisingly in this limited price range consumers will find a huge number of AMD and Intel offerings.In this price bracket processors can be found operating between 2.66GHz and 3.40GHz, but the differences between these go well beyond mere frequencies. The number of cores also varies with dual-core, triple-core and even quad-core processors available within this range. Other factors play an important role as well, such as cache and the thermal design power rating.