PCPartPicker part list / Price breakdown by merchant
CPU: Intel Xeon E3-1231 V3 3.4GHz Quad-Core Processor ($242.99 @ SuperBiiz)
Motherboard: Gigabyte GA-B85M-DS3H-A Micro ATX LGA1150 Motherboard ($41.98 @ Newegg)
Memory: Team Elite Plus 8GB (2 x 4GB) DDR3-1600 Memory ($34.99 @ Newegg)
Storage: Hitachi Deskstar 1TB 3.5" 7200RPM Internal Hard Drive ($43.50 @ Amazon)
Video Card: MSI Radeon R9 390X 8GB Video Card ($399.99 @ Micro Center)
Case: Cooler Master N200 MicroATX Mid Tower Case ($34.99 @ Newegg)
Power Supply: SeaSonic S12II 520W 80+ Bronze Certified ATX Power Supply ($41.99 @ Newegg)
Total: $840.43
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-10-21 14:16 EDT-0400
later buy 120mm rosewill hyperborea fan and 256gb ssd like 850 evo, its not much more expensive than mx100
after that, overclock gpu