I wouldn't run Win8 even with a free 27" touchscreen. I can't stand Metro. I can't stand the new explorer (file manager) with the bland metro fonts / colors and ribbon, nor that theme being fairly constant throughout other desktop panels... and I;'ll never buy shit from the Microsoft Store.
Basically... the only way I'd run Windows 8 or higher would be with Windowblinds or Aston replacing the shell. Classic shell is a good option for free, but it doesn't fix explorer and the rest of the desktop panels.
I don't understand how anyone thinks those fugly tiles are good looking... whether it's on a phone, tablet or a touchscreen desktop to take advantage of the gestures... It's just way too fugly for me to handle and, IMO, an extreme step backwards from Win7 or IOS / Android (For Touch)