Very informative answers. Well, stupidly, I had just bought this solely for the PSU upgrade, my old PSU was a wimpy stock 250w. I will sit on this for the time being and in two years think about getting a real PSU, depending on negative signs resulting from the various factors you mentioned.
As a last question, I was wondering if the 12v only provide to the video card or does it go to the MB, processors, HDD? My system is pretty low end overall, would this have any affect on the gradual wear of voltage? Provided my assumptions that the 12v affects these elements of my system are correct, of course. I know, kind of an off the wall question.