Ahem, read his first line in his post (i quoted it for you here).
If you don't know Jim is a pro DAW builder who is meticulous as all get out. I accept what he says as I know him to be thorough.
We Need @Jim Roseberry to chime in on 16gb system which is what I would choose along with 1tb or 2tb OS drive.
I think this would blow away my MacBook Pro Quadcore 8Gb 1tb.
Only problem I see is how to run two monitors.