Thoughts on these parts

Corsair psu's are just fine, nothing wrong with them. However, I would get the cx600 if you are going to be using the gtx 660.
 
Seasonic is made with better parts and only $5 more than the Corsair in his case. Also it has a critical part that the Corsair don't have.

By the way, some of the Corsairs are made by Seasonic but none of the CX series.
 
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520 watts isn't gonna be enough for his video card and the rest of his system. Your point is mute.
 
Unless you are doing anything which involves CUDA (such as video and photo editing), I'd probably recommend you go for a Radeon HD 7870 instead of the GTX 660. Better performance.
 
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