Hi larrys640, welcome
I think when considering a video editing machine, you should consider the following (in this particular order):
Support for multiple high-speed hard disks
Read/write speed of hard disks
Amount of RAM
Ability of video card(s) to drive multiple displays.
In other words, your first priority should be your video cards, but on getting a mobo that can support high-speed HDs. That's what you'll need first for a responsive video editing experience. Hope this helps!