I'm interested in putting a professional cad machine together or having someone assemble it for me.

A few of the basic specs I've considered are
AMD FX-9370 w/ water cooling
Asus Sabertooth 990FX MoBo
AMD 16gb Ram
AMD W7000 GPU
Samsung 840 Pro 128GB SSD boot drive

Other ideas:
2+TB HD
BlueRay read/writer
Three 24" monitors

The primary purpose of this computer is to operate SolidWorks.
I often perform simulations and renderings.