My Q6600/8G seemed to be getting a little long in the tooth as my primary workstation so I too am building a box off the Supermicro X8DTH-6F motherboard using these parts:
2x XEON [email protected]
6x 4G DDR3 ECC REG DIMM
1x 300GB SAS 15K
2x 1T 7200's 16M
1x 1.5T 7200 32M
1x EVGA GEFORCE 460...