430 watts is plenty for that system assuming you dont have fifty harddrives or tons of lights or anything. it also depends on what company, can it deliver 430 watts of power constantly?
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CPU || e8400
RAM || 2GB corsair xms2 pc6400 800mhz
HDD || 2x WD Raptor 150GB 2x WD 500GB
MBO || EVGA 680i SE
GPU || Evga 8800GT Superclocked w/ Accelero
PSU || Silverstone 750 watt
Case|| Antec p182
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