The part where I'm stumped is with the PSU and the motherboard. For the mobo I have no diea what I should use. For the PSU, I've read about people using 850 watts PSU but I went on some online power calculators and it had some higher numbers. Can anyone help me out on figuring out what component to buy? Also, should I buy a cpu cooler? The case I bought comes with 3 fans.