Here is something based on "Kay's Number Cruncher" in "BestConfigs - High-End Workstation" thread. Let me know if you think it is optimal.
I'll use it for scientific computation, large data analysis and numerical simulation. I'll install Ubuntu on it.
Processor: 2 x Intel Xeon X5690 @ $1700 each
Motherboard: SUPERMICRO MBD-X8DAH+-O Dual LGA 1366 @ $450
RAM: 3 x WINTEC 48GB @ $1000 each
Graphics Card: EVGA 01G-P3-1373-AR GeForce GTX 460 @$190
Boot Hard Drive: OCZ RevoDrive 220GB @ $520
Program Hard Drive : HITACHI Ultrastar 15K600 600GB @ $460
Data Hard Drive: SAMSUNG EcoGreen F4 2TB @$80
Case: LIAN LI PC-V2120B Black Aluminum ATX Full Tower Computer Case @$400
Power Supply: CORSAIR CMPSU-750TX 750W @ $115
Cooling: Intel BXSTS100A Active heat sink with fixed fan @$35
DVD Burner: ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM @ $20
Monitors : 2x AOC e2343F @ $190 each
Total $9020
I'll use it for scientific computation, large data analysis and numerical simulation. I'll install Ubuntu on it.
Processor: 2 x Intel Xeon X5690 @ $1700 each
Motherboard: SUPERMICRO MBD-X8DAH+-O Dual LGA 1366 @ $450
RAM: 3 x WINTEC 48GB @ $1000 each
Graphics Card: EVGA 01G-P3-1373-AR GeForce GTX 460 @$190
Boot Hard Drive: OCZ RevoDrive 220GB @ $520
Program Hard Drive : HITACHI Ultrastar 15K600 600GB @ $460
Data Hard Drive: SAMSUNG EcoGreen F4 2TB @$80
Case: LIAN LI PC-V2120B Black Aluminum ATX Full Tower Computer Case @$400
Power Supply: CORSAIR CMPSU-750TX 750W @ $115
Cooling: Intel BXSTS100A Active heat sink with fixed fan @$35
DVD Burner: ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner - Bulk - OEM @ $20
Monitors : 2x AOC e2343F @ $190 each
Total $9020