Specs

Case: $50
  Rosewill CHALLENGER Black Gaming ATX Mid Tower Computer Case, comes with Three Fans
    1x Front Blue LED 120mm Fan,
    1x Top 140mm Fan,
    1x Rear 120mm Fan,
    option Fans-2x Side 120mm Fan
  http://www.newegg.com/Product/Product.aspx?Item=N82E16811147153

Motherboard: $230

  http://www.newegg.com/Product/Product.aspx?Item=N82E16813130681

RAM: $180
  2x G.SKILL Trident X Series
  8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 2400 (PC3 19200) Desktop Memory Model F3-2400C10D-8GTX
  I'm going to buy two so as to have 4 x 4GB
  http://www.newegg.com/Product/Product.aspx?Item=N82E16820231587

CPU: $580  /  $1020
  3.4GHz Intel Core i7-4930K Ivy Bridge-E LGA 2011 130W
  Six-Core Desktop Processor BX80633i74930K
  http://www.newegg.com/Product/Product.aspx?Item=N82E16819116939

  -OR-

  3.6GHz (Turbo 4GHz) Intel Core i7-4960X Ivy Bridge-E LGA 2011 130W
  Six-Core Desktop Processor BX80633i74960X
  http://www.newegg.com/Product/Product.aspx?Item=N82E16819116938

GPU: $550  /  $730  /  $1020
  MSI N780 LIGHTNING GeForce GTX 780
  3GB 384-bit GDDR5 PCI Express 3.0 HDCP Ready SLI Support Video Card
  http://www.newegg.com/Product/Product.aspx?Item=14-127-754
  http://www.newegg.com/Product/Product.aspx?Item=N82E16814130951

  -OR-

  EVGA 03G-P4-2883-KR GeForce GTX 780 Ti Superclocked
  3GB 384-bit GDDR5 PCI Express 3.0 SLI Support Video Card
  28
  http://www.newegg.com/Product/Product.aspx?Item=N82E16814487001

  -or-

  EVGA 06G-P4-2791-KR GeForce GTX TITAN SuperClocked
  6GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP, SLI Ready Video Card
  http://www.newegg.com/Product/Product.aspx?Item=14-130-899

PSU: $150
  850W CORSAIR HX Series HX850 ATX12V 2.3 / EPS12V 2.91 SLI Ready CrossFire Ready 80 PLUS GOLD Certified
                         Modular Active PFC Power Supply New 4th Gen CPU Certified Haswell Ready
  http://www.newegg.com/Product/Product.aspx?Item=17-139-011

Cooling system: ???