the supermicro seems to be a good mobo.
https://www.supermicro.com/products/motherboard/xeon/c600/x9drl-7f.cfm
Let us know what you have decided. i am torn between a single i7 with 6 cores or dual xeon that i can get 12 cores. planning on running a windows server VM as a file/backup server for my home.