I was going to buy a Power Supply as well, but we (with the CompUSA guy too) decided it was better to go with a 2-year Warranty (which we probably would have gotten anyway) ... and then that way, if the Power Supply failed or something, we'd have coverage on our CPU.
I will upgrade the Power Supply eventually if I get some money. Meanwhile I will back up anything important on my Hard Drive to an external just in case
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How do you guys rate the change? It cost a little bit cheaper too.