Better build it urself then u would be most certain to buy it. If you got 1k $ so it's fckin alot for a computer in my country for this money i could buy this:
CPU: AMD PHENOM II X6 1055T 6x2,8GHz AM3! TURBO 4x3,3GHz
Graphic Card: ATI RADEON HD5850 1GB DDR5 DIRECTX 11
RAM: 8GB DDR3 1333MHz
DVD-RW DUAL LAYER
Hard drive: 1TB 64MB SATA2
MB: Gigabyte GA-790XT-USB3
which is a fckin awesome computer

Radeon 5850 is one of the best graphic cards atm, six core processors are the newest.