Toshiba LX815-D1210 B970 21.5" AIO Desktop $550 at Newegg

Newegg has the Toshiba LX815-D1210 B970 Dual-Core 21.5" All-in-One Desktop (Black) for $650 - $100 off with coupon code TOSHI925 [Exp 10/15] = $550 with free shipping. Windows 7 Home Premium 64-bit installed. Amazon also has it for the same price.

Intel Pentium B970 2.3GHz, 4GB DDR3, 1TB HDD

1920 x 1080 LED LCD, Intel HD Graphics, 802.11b/g/n