HGST Deskstar NAS 4TB 7200rpm, SATA 6Gb/s, retail
NAS drives do not work well in desktops. Get a Western Digital Caviar Black HDD. You won't be disappointed.
1 xSamsung SSD 840 EVO 500GB, 2.5", SATA 6Gb/s (MZ-7TE500BW)
Good choice
1 xIntel Xeon E3-1230 v3, 4x 3.30GHz, Sockel-1150, boxed
Get a 4670K or 4770K. Or, if you never plan to overclock the chip, a 4570 or 4670 or 4770.
1 xKingston HyperX Beast DIMM XMP Kit 16GB, DDR3-2400, CL11-13-13 (KHX24C11T3K2/16X)
You can go 1866Mhz and save some money.
1 xMSI N770 TF 2GD5/OC Twin Frozr Gaming, GeForce GTX 770, 2GB GDDR5, 2x DVI, HDMI, DisplayPort (V282-052R)
I'd go with atleast 3GB DDR5 on any GPU I was buying at this point.
Everything else in your build looks fine.