Actually getting those 2 6 core cpus is completly poittless for gaming.
You would be much better with
single 6 core intel 980X or xeon equvalent
3 highest clocked 480GTX all put under high end water cooling system and overclocked to the roof.
and the reason why 480GTX is better in this case is because you can use 3 monitor 3d surround gaming
Also you definitly went wrong on storage - get LSI or other good brand sas/sata raid controler and put 8 sand force based SSDs into it for 2 GB/s reads
http://www.youtube.com/watch?v=96dWOEa4Djs
PROUD MEMBER OF THE PSP RPG FAN CLUB