HP ProOne 400 G1 All-in-One Intel Core i5 4590T (2.0 GHz) 4 GB DDR3 500 GB HDD Windows 7 Professional 64-Bit (available through downgrade rights from Windows 8.1 Pro) - Newegg.com
HP ProOne 400 G1 ALL IN ONE NON TOUCH 19.5 Inch Desktop (P5B30PAACJA)/ Intel Core