This particular model the iBuyPower Gamer Supreme AM972SLC Desktop (Black) has great specifications.
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Here is what Amazon says about this computer:
Experience a new dimension of interactive gaming, media organization, and content creation with the IBUYPOWER's Gamer Supreme AM972SLC. Equipped with a powerful Intel i7-2600k processor clocked at 3.4 GHz, the Supreme AM972SLC operates with smooth precision and elegance. Designed to handle most of the current games that require high processing power and intense graphics, the Supreme AM972SLC is the perfect system for the most avid gamer.
Complementing the i7-2600k core processor is 16 gigabytes of DDR3-1333MHz Memory for an overall accelerated performance taking your gaming experience to the next level. IBUYPOWER's Gamer Supreme AM972SLC also comes with a spacious and speedy 2TB Hard Drive for endless storage. In addition Supreme AM972SLC also has a powerful GTX560 2GB video card and 800W power supply. For a more than capable high performance gaming computer at a value price, embrace the power of the Gamer Supreme AM972SLC Desktop.