Dell Inspiron Slim 620 Desktop PC for $479.99 shipped by clicking through this link.  Here is a screenshot for your reference.  It features an Intel Core i5-2320 quad-core processor at 3.0GHz with Turbo Boost to 3.3GHz, 6GB DDR3 RAM, 1TB hard drive, 16x dual layer DVD burner, wireless 802.11b/g/n, Gigabit Ethernet, and Windows 7 Home Premium (64-bit).