abit fatal1ty aa8xe, 3.46ghz pentium 4 extreme edition, 4gb ddr2 533 ram, 2x geforce 6800 ultra pci express
tyan thunder k8w (s2885), 2x amd opteron 850, 16gb pc3200 ddr ram, geforce 6800 ultra agp
The dual opteron, wait for nforce 4 for SLI and get 2 geforce 6800 ultras ^_^
Then he'll have to cut back to one CPU.
I suggest just getting the highest Athlon 64, then a NForce4 SLI board (Like the ASUS A8N-SLI), and dual 6800 Ultra PCI-E.
And 16gb RAM? Do you really need that much?
AMD64 > All.
But make sure you run Linux or something on that machine. I don't know if Windows supports that kind of hardware.
Tyan Thunder line is a MONSTER. It will destroy that shitty Abit motherboard. PCI-X is as good as PCI-express for most purposes.
Make sure and use SCSI if you're going to spend that kind of money on a mobo.
Also, dual opterons >> single P4, always.