There are probably better PSUs for the price like the xfx and rosewill you mentioned, but I had to cringe a little when you said the seasonic is only on par with the CWT based corsair series as if the corsair cx series should be a standard. I agree that even if it were seasonic, it would be a bad idea to go with brand loyalty alone, but I would take a lower level seasonic s12ii over a corsair cx any day. The seasonic might be lacking in features like modularity, but the s12II line still has great build quality and decent components. I might not put either in a such an expensive system, but if I had to choose, I would choose a seasonic based model over a CWT based one for sheer reliability and performance.
Can you post a link for a video of when you completed hardware installation and performed first boot up through final OS install?
Finally finished the OS install video - you can find it here: http://www.youtube.com/watch?v=OLfypHr4ooI