Im put together my workstation, its with Server mobo, try search for workstation setups... where you live ?
the Professinal cards are nothing extra as performance wise, we have here HP with Quadro 2000, and it s much slower as my 7970, not mean in AGI, but in 3D printing sw where we place models. im bit dissapointed too with the display performance....
Professional cards are good for CAD, because of optimized drivers for that task, but not so good for compute...