I was told to go with something a little bigger for a PSU to support OC'ing CPU and GPU's and allow for capacitor aging.
While i don't know i also see RAIDMAX is less than recommended on other posts.
I think something like a corsair TX series or the XFX core pro's would be the best choice they are kind of budget orientated. They are also both made by seasonic which is an excellent brand of PSU, but expensive.
I'd skip the Vengeance with their tall heat sinks......the 'cool looking" fins are a remnant of days gone by when such fins actually served a purpose. Today they are just there for looks and serve no useful purpose. THG once reported that removing them sometimes even improves thermal performance.
22.3 % (SLI) increase in minimum frame rates w/ C6 instead of C8 in Far Cry 2
18% (single card) / 5% (SLI) increase in minimum frame rated w/ C6 instead of C8 in Dawn of war
15% (single card) / 5% (SLI) increase in minimum frame rated w/ C6 instead of C8 in World in Conflict