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I would agree with most of your suggestions except for the power supply. 400 watts is overkill for most users. The average user will have power to spare if they have a 300 watt supply.
Sorry, I'm just used to people running RAID, a DVD-Rom + CD/RW, GeForceFX/Radeon9700Pro, 3-4 fan type systems. If however you run a single HDD with a single optical (DVD or CD), and a Video card that deosn't need external power, then 300W is fine...