Skulltrail, 2x QX9???, 8G of FBDIMMs, 2x 9800GTX or 9800GX2, 4x 750GB hd from your favorite vendor. Congratulations, enjoy your obscenely overpriced, fastest of what's available today rig. Rest secure in the knowledge that in less than 6 months lower end mainstream PCs built on a ~$500 budget will match its performance, and in 12 months will obliterate it.
Go cheap, upgrade more often. Seriously. If you want pure, unadulterated godzilla-sized e-peen go with my suggested parts. You'll have to dial the CPUs to 4 ghz, of course.