I think some people don't have a gaming computer because they cost a lot, but if you want to play new games on pc and you still can play new games until 2015, so your pc is futureproof. You can add your own monitor or any other accessories it you like. Below here is the base price of the whole part.
CPU: Intel Core i7-3930K 3.2GHz 6-Core Processor: $569.99
CPU Cooler: Corsair H80 92.0 CFM Liquid CPU Cooler: $89.99
Motherboard: Asus Sabertooth X79 ATX LGA2011 Motherboard: $314.99
Memory: Corsair Vengeance 16GB (4 x 4GB) DDR3-1600 Memory: $75.99
Storage: Western Digital Caviar Black 2TB 3.5" 7200RPM Internal Hard Drive: $159.99
Intel 520 Series Cherryville 180GB 2.5" Solid State Disk: $189.99
Video Card: 2x EVGA GeForce GTX 680 2GB Video Card: $939.98
Case: Cooler Master Storm Stryker (White) ATX Full Tower Case: $159.04
Power Supply: Cooler Master Silent Pro Gold 1200W 80 PLUS Gold Certified Power Supply: $222.99
Optical Drive: Asus BW-12B1ST/BLK/G/AS Blu-Ray/DVD/CD Writer: $82.50
Total Price: $2805.45
CPU: Intel Core i7-3930K 3.2GHz 6-Core Processor: $569.99
CPU Cooler: Corsair H80 92.0 CFM Liquid CPU Cooler: $89.99
Motherboard: Asus Sabertooth X79 ATX LGA2011 Motherboard: $314.99
Memory: Corsair Vengeance 16GB (4 x 4GB) DDR3-1600 Memory: $75.99
Storage: Western Digital Caviar Black 2TB 3.5" 7200RPM Internal Hard Drive: $159.99
Intel 520 Series Cherryville 180GB 2.5" Solid State Disk: $189.99
Video Card: 2x EVGA GeForce GTX 680 2GB Video Card: $939.98
Case: Cooler Master Storm Stryker (White) ATX Full Tower Case: $159.04
Power Supply: Cooler Master Silent Pro Gold 1200W 80 PLUS Gold Certified Power Supply: $222.99
Optical Drive: Asus BW-12B1ST/BLK/G/AS Blu-Ray/DVD/CD Writer: $82.50
Total Price: $2805.45