First, 2k for both machines sounds over priced to me.
Depending on the CAD Software I'd consider adding a 3d Card.
You also can build a AMD 8core fx8320 for less then that i5 and it's faster then the i5.
I would also step up to a better monitor at the very least 1920x1200 , But I'd more towards a 2560x1600 Monitor if I was doing cad.