My Top Motherboard Picks:
- Z97 Gaming 5,  MSI Z97 Intel LGA 1150 DDR3 USB 3.0 ATX Gaming Motherboard http://a.co/7a6Sut8
- ASRock H97 Anniversary LGA 1150 Intel Motherboard (usually sold out): http://amzn.to/2cl9G48   or   http://www.newegg.com/Product/Product.aspx?Item=N82E16813157564
- ASRock H81 PRO BTC R2.0 http://www.newegg.com/Product/Product.aspx?Item=N82E16813157724
- BIOSTAR TB85 LGA 1150 Intel B85 SATA 6Gb/s USB 3.0 ATX Motherboards http://www.newegg.com/Product/Product.aspx?Item=N82E16813138436

If you want 7 Gpu use the Z97 Gaming 5 or add a PC Peripheral onto any of the other boards:  http://www.ebay.com/itm/141865200790?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Here is a video on how to install the PC Peripheral:  https://youtu.be/F7p6roA8ZCU

-OR Even Better -

See my Rig at:  https://bitcointalk.org/index.php?topic=1676763.0