Which PSU is the best out of these?

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I'd go wth the XFX Pro that is made by Seasonic. The VP550P is made by Delta Electronics is also a good PSU but I would want all of the cables sleeved. The OCZ imade by Sirtec is also good. All are well reviewed by reputable PSU review sites.
XFX Review: http://www.kitguru.net/components/power-supplies/zardon/xfx-pro-series-450w-and-550w-power-supply-review/8/
OCZ Review: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=248
VP550P Review: http://www.techpowerup.com/reviews/Antec/VP550P/

I wouldn't have an issue buying any of those three PSUs....choose whichever one is the least expensive.
I'd go wth the XFX Pro that is made by Seasonic. The VP550P is made by Delta Electronics is also a good PSU but I would want all of the cables sleeved. The OCZ imade by Sirtec is also good. All are well reviewed by reputable PSU review sites.
XFX Review: http://www.kitguru.net/components/power-supplies/zardon/xfx-pro-series-450w-and-550w-power-supply-review/8/
OCZ Review: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=248
VP550P Review: http://www.techpowerup.com/reviews/Antec/VP550P/

I wouldn't have an issue buying any of those three PSUs....choose whichever one is the least expensive.
 
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