Building a performance computer that is also quiet and cost effective is a fun challenge. The Blamsoft Mainframe has been online for a few months but recently got some great upgrades. The main hard disk has been upgraded to a RAID 10 configuration with four 512 GB Samsung SSDs. These are fast high quality drives. After having a Crucial drive flake in and out it was too risky to keep it. And the fans have been updated to whisper quiet red led models.
As far as the existing components, the EVGA GTX 690 is the single most expensive part in the build, but worth it for the graphics side of developing Rack Extensions, and using three monitors. The motherboard is an Asus P9X79 Deluxe, which has socket 2011 and modern connectivity. It currently has 32 GB or ram and a 3.6 GHz quad core. The ram will be updated to 64 GB and cpu to an eight core some day when the prices come down.
Everything for the computer was purchased from Newegg.
Update 7/30/14: After some headaches, the processor is now a 3.6 GHz six-core with 4 GHz Turbo Boost.