Building PC with ASUS Sabertooth Z77 LGA 1155 Intel Z77 HDMI SATA / 6Gb/s, USB 3.0 ATX Intel motherboard. 512GB SSD, 2TB Storage, 850 Power supply, Blue Ray Burner. Looking for suggestion on Video Card - looking for CUDA core. Considering NVIDIA GeForce GTX 680 or Quadro 2000D. Anyone with experience who can suggest? Thanks.