The thing is no matter what case you use, running SLI/Crossfire configuration is on Micro-ATX board for air-cooled cards you are just asking for trouble, as the top card will ALWAYS struggle to breath with the bottom card blocking its "nose" (the cooler of the top card in this case).
It's only worth considering if you were going watercooled.
Fair enough I had decided it was likely best just to get a 980Ti anyway due to the additional VRAM and try and sell my 970.