why on gods green earth would you ever buy from amazon.com? newegg.com has virtually everything you have for cheaper.
id suggest crucial ballistix ram, its $110 w/ a 20 or 30 dollar MIR and better than OCZ.
Secondly, gofor the seagate barracuda 7200.10 250gb perpendicular recording technology 16mb cache, those things are dynamite.
also, id suggest getting the evga 8800gts 320mb over the radeon, on par performance, except the nvidia is better made, more overclockable, more reliable, and cheaper, (IMO)
finally, youll probably be fine with a corsair 520hx.