Acer Desktop PC Veriton VX498G-Ui5650C Intel Core i5 650 (3.20GHz) 4GB DDR3 500GB HDD Windows 7 Professional 64-bit - Newegg.com
Acer Desktop PC Veriton VM4630G-i54570X Intel Core i5 4th Gen 4570 (3.20GHz) 4GB DDR3 500GB HDD Windows 7 Professional 64-Bit upgradable to Windows 8 Pro - Newegg.com
Acer Aspire AM3970-UR14P DT.SJYAA.003 Desktop PC - 3rd Gen. Intel Core i5-3450 3.1GHz, 8GB DDR3, 2TB HDD, DVDRW, Windows 7 Home Premium 64-bit, Keyboard & Mouse at TigerDirect.com