Are you going to go SLI or single GPU? What video card(s) are you looking at getting?
I've been using the same 500W Xion PSU for 5+ years and have upgraded my motherboard at least twice during that time. I currently have an ATI 5770 with an Intel i5 quadcore 3570K with 2 SATA HD's and a DVD burner internal. I've never had power issues.
On some of the cheaper PSU's however, the current will degrade over time making people think that they need to get an 800W or above when there is no need, unless you are expanding your GPU capabilities or HD numbers greatly. If you are going to upgrade the PSU, get something that will last, like a Corsair branded one.
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Mokli - Druid of Karana
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