So yeah this would be the most powerful computer that could still be called a "Personal Computer".
Case - LIAN LI PC-B70 Black Aluminum ATX Full Tower Computer Case
Power Supply - 1000 Watt Corsair Power Supply
Mainboard - EVGA X58 based chipset with DDR3, PCI Express, 3-way SLI!
Processor - Intel® Core? i7 Extreme Edition i7-965, quad 3.2GHz cores, 8MB Cache, 6.4 GT/sec
Processor Cooler - ZALMAN CNPS 9700 CPU Cooling Fan/Heatsink
RAM - 12GB DDR3 - 1333 Triple Channel Memory
GPU - 2 x 1792MB NVIDIA® GeForce? GTX 295 Plus in SLI (LXe/GX2 Case & 850 Watt PSU required)
Audio - Razer? Barracuda AC-1, Gaming Audio Card
Hard Drives:
Number 1 - 2 x 80GB Intel® X25-M SATA Solid-State Drive Raid 0 Stripe
Number 2 - 300GB Western Digital Velociraptor 10,000RPM SATA/300, 16MB Cache.
Approximate Price - $7500 US Dollars.