What's the memory?
No dedicated video storage?
Have you thought about replacing the 580 with the 670?
Memory - 16GB G Skill 16G(2x8G) DDR3 1600MHZ PC3-12800 CL10(10D-16GBXL)
Workflow is download to hard drive, edit and produce, then archive on externals.
Yes I thought about the 670 but I don't see it listed as a supported card on the Adobe site? http://www.adobe.com/au/products/premiere/tech-specs.html
What do you mean dedicated video storage? I always work my projects on my main drive then archive on externals.
If that works for you, I see no problems with your build.
670 would be a better card; easy to enable GPU accel with it; will likely make it to the supported GPUs list eventually.
Minimum Specs from Adobe is two drives, your boot and applictions and a second drive (at least 7200 rpm) for your projects.