Seeing how some of the recent post got flushed...While Corsair does sell some good power supplies, they are not always the way to go. You also shouldn't limiting yourself through a narrow scope of brands, when there are many excellent brands out there that sells their units for not only cheaper but may even be superior in terms of performance, build quality, functionality, etc.
The power draw of your system isn't every high as mentioned before, that you could power your system on a Seasonic G 360w. Here's a system with someone having it powered a a 3770 and GTX670. http://www.overclock.net/t/1126863/real-world-power-usage-user-submitted-values/170#post_18164451
So, you don't need invest in a >550w unit for your system. If you have plans to CFX that 7850 you could go with that Rosewill Capstone 450w that Sin had recommended. Alternatively, you could also get the Seasonic G SSR-450RM if you want a PSU with modularity, but the shipping cost made it the same as the 550w unit. http://www.newegg.com/Product/Product.aspx?Item=N82E16817151119