Not sure why you don't go with the Mac Pro tower (5.1) 6 core. Massively expandable, already built for 2 displays and perfect for Logic, Creative Cloud stuff. Sure they're 8 years old but they're well built.
Like ChrisBMX says, they've been around forever and the new version is about to come out, why would you even consider it? They didn't even have a demo version at the Brisbane Apple Store for me to try out (incidentally, with what?!?) when I was last there...
Not sure why you don't go with the Mac Pro tower (5.1) 6 core. Massively expandable, already built for 2 displays and perfect for Logic, Creative Cloud stuff. Sure they're 8 years old but they're well built.