I thought you are gonna invest in FX series (AMD) or EE series (intel) as I read topic header (blazing system).
for this what you are going to buy.
Not to mention, AMD Rulez, DO NOT BUY nVidia FX series (you'll regret, thats a sure deal), nVidia themselves said that they hadnt showed performance in thier FX Series, though 6800 rocks.
and as if you are gonna built AMD AthlonXP, my most recommended board is, Asus A7N8X - Deluxe (was my previous system, damn it was performance).
Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
XFX 9600GT AlphaDog
Seagate 2 X 320GB SATA2
LG L246WH Flatron 24"