Motherboard; Newegg.com - ASUS Z8NA-D6C Dual LGA 1366 Intel 5500 ATX Dual Intel Xeon 5500 and 5600 Series Server/Workstation Motherboard ( Not the best one just thought that two CPU's are cool. )
Graphics Card; You have to pick really
All of the other stuff is completely your choice like case, power supply, if you want a liquid cooled computer.