I wouldn't get anything branded xtreme gear especially the power supply.
The raidmax is better but not a whole lot go with a good one such as corsair, cooler master or thermal take. A good 650 watt from any of those companys will be fine unless your planning to xfire in the future then go at least 750w or 850w.
i would avoid that power supply. Get a more known bran. Also avoid cp too... In the last 9 years i have bought 3 computers. 1 from CP, built one, and custompcandrepairs was my last one. I saw good posts on here about them so i tried them. Building it myself was the mot satisfying, yet time consuming. CP was nothig but a headache with a mediocre product, and custompcandrepairs was the easiest most hassle free way. Building it yourself will be a little cheaper but not by much.