Do I really need a new computer?

That ran that g-unit recommended is okay. But to utilize the ram to it's full potential, given your cpu choice (good one by the way) I would recommend 1600 Mhz. I suggest looking up corsair vengeance. Corsair has amazing quality control on their products and you can almost never go wrong with them. Everything else looks good. As far as building it since you're going off to college soon, I would say go for it. It will last you for a while and may come in handy when doing other intensive tasks, such as if you go into any sort of graphic design classes. I would say that it would definitely be worth it. When you leave though, I would suggest taking out your hard drives and placing them some where safe, where they wont be shaken as much (that is if you are driving) If not dont worry about it. Also, I wouldn't recommend that case if youre going to be going places with it, but if you will only be moving it once, that is fine. It is a verrryyy nice case, and I my self just bought the full tower version. Best of luck. If you have any other questions go for it! I'm more than willing to answer.