There a "well known" brand and 450w is a good amount. I'v never used one so I couldn't say about good or bad! Do a "Enermax" serch on the sight and/or in google to find opinioms or reviews.
I doubt you'll be disapointed. Something that really matters is wht and how much stuff is in your box. If you have a few HDs a high end vid card and a ROM you should be fine with 450w.
The only real scarry PS are the unknown generic units which are usually overated and not up to the task.
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