You know from a person who doesn't have any prior knowledge on building a computer. I can say that does it really matter how freakin' fast/powerful the computer is? Let's all be honest here, if you pay like 1k-2k dollars in modeling a computer to run highly-graphic games like Crysis then you just shooting yourself in the freakin' foot! Why?!?
Because over the years, everything BREAKS down; this is coming from a person who had to rebuild the computer from scratch because the old Compaq PC started breaking down in 2007 when it was bought around 2002. The motherboard had to be replace, the Power Supply, RAM, CPU, everything except for the tower. Then last year the Hard Driver that came with it started to fuck up. Most people think that building something that's man made is suppose to last forever, that's not true!
Hey! If you want to buy the most expensive stuff just make your computer go faster, stronger than before be my guess. Remember that you also have to pay for anti-virus, spyware, and etc. In the end those might not work any more then you will have to spend more money! So please be grateful what you have now because you might need that money for something else!