One minute, awsome590, if you want the PC runs longer you need get the other PSU, here is review for Cooler Master 550W V2, I think the 500w may as same the 550W one.
http://www.jonnyguru.com/modules.php?name=NDReviews&file=print&reid=386
Also you may check out the intel Pentium G3258, that will be silmilar to AMD Athlon II X4 750K CPU for the games. It depends on where you are, you maybe get lower $$.
Here is the review.
http://www.tomshardware.com/reviews/pentium-g3258-overclocking-performance,3849.html
http://www.tomshardware.com/reviews/pentium-g3258-b81-cheap-overclocking,3888.html