I bough this

from HP.

Not for D800 (PO request not officially submitted to LD yet :->) but for the power to run multiple image processing softwares concurrently. Guess it should be good for D800 too:

• 2nd Generation Intel(R) Core(TM) i7-3930K six-core processor [3.2GHz, Shared 12MB Cache]
• 10GB DDR3-1600MHz SDRAM [3 DIMMs] 
• 2TB 7200 rpm SATA hard drive
• 1GB AMD Radeon HD 7570 [DVI, HDMI, DP, VGA adapter]
• 460W Power supply
• SuperMulti DVD Burner
• 15-in-1 memory card reader, 2 USB 2.0 (front), audio, 2 USB (top rear-facing)

• Beats Audio (tm) -- integrated studio quality sound

 At price ~$1100. It's very fast and quiet.