I'm more of buying a new PC than assembling it for the reason that I'm not so technical person and there are some PC's who offer complete package. They will bring you the latest chips or latest parts without you thinking what will be the best fit for a specific reason. 

A good thing I like the most about buying NEW PC is that it is built with confidence and trust. It is designed, manufactured and collaborated with experts around the world. 

So, instead of twisting my brain or posting on Facebook to help me what specs will I buy to assemble a new PC, I'd rather buy a new one.