If I had an unlimited budget I'd get the following:
http://www.go-l.com/desktops/machl38/features/index.htm
That is one hell of a PC!

Here is a glance at the specs:
- Intel P4 Extreme Edition @
3.8 GHz with 950 FSB
- 180W Sub-zero Vapor Compression Cooling
- Up to 4 GB of Dual-Channel DDR RAM @ 533 MHz
- O/Ced ATi Radeon 9800 Pro with High-Definition Component Video Output
- 1
TERABYTE of storage (Optional RAM Drives)
- Up to 74 full-length 32-bit or 64-bit PCI slots
-
92" LCD Displays with resolutions of 6400x1200 pixels