Gateway DX4870-UR368 Desktop PC for $629.99 shipped.  Here is a screenshot for your reference.  It features a 3rd generation Intel Core i7-3770 quad-core processor at 3.4GHz with Turbo Boost to 3.9GHz, 6GB DDR3 RAM, 1TB hard drive, dual layer DVD burner, Gigabit Ethernet, multi-in-1 media card reader, Windows 8 (64-bit) and more.  Most places have it for about $699.