I'm looking to get a good gaming computer so I was looking to get something like this
PROCESSOR Intel® Core™ i7-3820 (Quad Core, 10MB Cache) Overclocked up to 4.1GHz
OPERATING SYSTEM Windows® 7 Home Premium, 64Bit, English
MEMORY 8GB Quad Channel DDR3 at 2133MHz
VIDEO CARD 2GB GDDR5 AMD Radeon HD 7870
HARD DRIVE 1TB Serial ATA 3 Hard Drive
MONITOR No Monitor
SOUND CARD Integrated 7.1 Channel Audio
OPTICAL DRIVE Single Drive: 24X CD/DVD burner (DVD+/-RW) w/double layer write capability
Check out cyberpowerPC.com. You get all those components but its much cheaper! There are so many customizable options, and you can change your Case, CPU, GPU, etc. They will build the computer for you, and ship it to you. I personally have one, and its great!
I currently play on High, because of more FPS. I could play on Ultra too, but it would be around 30-60 fps max on 1920x1080 monitors.
GPU: EVGA GTX 570 HD 1.5 GB
CPU: Intel Core i5 2500k
Hard Drive: 1TB 7200 RPM
Hard Drive: 64GB Kingston SSD
Case: Azza Solano 1000
Motherboard: Gigabyte GA-z68a-d3h-b3
Power Supply: Corsair 750 Watt
RAM: Corsair Vengeance 8GB
I got this rig for 1200$, and it will run better than the Alien Aurora, saving 300$.
it is better to spend less for the cpu and mobo and more for the graphic card.
it is better to go with lga1155 Z77 mobo and i5 3570k.
graphic CARD: at least hd 7950. i suggest you to go with gtx 670 or hd 7970.
ram:save your money and get 8gb at 1600mhz.there is no difference between 1600mhz and 2133MHz in gaming.