Never, ever, EVER buy a cheap no name brand PSU like Raidmax. Buy a good known brand like Seasonic or XFX.
The cheap PSU's give less W than advertised and are a danger to your build overall, especially when you got a good overclocking GPU and CPU.
My advise would be being an SSD (Crucial MX100) and a new PSU (SeaSonic M12II 520W or similar from a good PSU maker)