I voted Windows 7. I like everything about it (just about) It is the last TRUE Windows OS. Ver 8 is really something new, consumer oriented, touchpad oriented, not Windows. From Windows 95 to Windows 7 there is familial resemblance. Windows 8 leaves us suspecting the parentage..;)
Asus Maximus V Extreme BIOS 1903, see specs above avatar.
Asus G73 jh A1 laptop, BIOS 213, vBIOS OD2, 8 GB Ram, 240 GB Intel SSD, 180 GB Intel SSD. Win 7 Pro. Purchased new from PowerNotebooks.com in May 2010.
(both have 1920X1080 hd screens, mine above, hers below )
Asus G73 Sw XR1 laptop 8 GB Ram, 160 GB Intel SSD, 80 GB Intel SSD. Purchased used >Ebay 1/10/13, Did clean install of Windows 7