I’m with John about wishing for a straight-forward pro computer for production work.
My 2006 Mac Pro 1,1 needs replacement only because I would like to update some software and I’m looking at later Mac pros, as in 4,1 and 5,1. Hearing about the experience with 10.9 helps me think about what OS version to begin with.
I run N5.6 and may not change, largely because I really like the mixer, and I don’t want to upgrade the OS past where N5.6 will run on it!
Thanks all for weighing in with your own experiences.