This worked really well. I'm very glad I went with 64 GB of RAM, rather than 32. It wasn't hard to install Windows 7 pro from a USB 3 key, since Asus provides a utility for modifying the windows 7 image (acquired from microsoft).
Get the best video card you can with the most memory. I built this days before the 1080/1070 stuff came out, but I chose a card with proven cooling ability and performance anyway. I'm not a fan of first-gen gaming cards for workstations. I'd rather get a good proven card from the previous gen.