Asus Matte Dark Brown 15.6" K55A-RBR6 Laptop PC with Intel Core i5-2450M Processor and Windows 7 Home Premium with Windows 8 Pro Upgrade OptionAsus Matte Dark Brown 15.6" K55A-RBR6 Laptop PC with Intel Core i5-2450M Processor and Windows 7 Home Premium with Windows 8 Pro Upgrade Option  $478.86