According to me you should go for the Intel Core i7 920 processor for the desktop which you want to build. As the things you have mentioned in your query it requires very good processor and the very supportive motherboard too. So i think you should go for the ASUS Rampage II GENE motherboard which supports the Intel Core i7 processor. I think this motherboard fulfills all the requirements. Refer the link given below to check the details of ASUS Rampage II GENE motherboard.
http://usa.asus.com/product.aspx?P_I...fY9&templete=2
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