A 500-watt power supply should be adequate if you aren't loading up with multiple hard drives, a high-end video card, and other energy-hungry devices beyond the items recommended here. Go green if possible, with the latest energy-efficient spec, 80 Plus. I chose the Antec NeoPower 650 because of its quiet fan; its 650-watt rating provides a generous margin for growing with future upgrades.
Power supply price: $130
System subtotal: $830
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