that really is a waste of money but it is your choice, so in that case, get 2 * 200 or 2*250GB harddrives instead of 1 *400.
i dont think that your motherboard and 2 gpu's will go together considering that mobo has only one agp slot and sli needs 2 pci-ex slots.
you should think of changing that 2 Asus A8N-SLI Deluxe nForce-4 SLI Chipset when they fix it up or one of the gigabyte ones.
I dont know if your case comes with a power supply or not but if not, i recommend getting a 500 or 600W to power that beast.
anyway thats about all i can say about that.
You could tone down the system a bit, say about 2-3 grand and get a sweet gaming laptop. Hook those up and you got yourself a nice home network.
edit : or your could alwas just go visit AlienWare or iBuyPower or some other big compagny and get them to make it for you