eadlef :
Get Windows 8.1, it has our beloved start button. It's the most up-to-date OS out there and I would personally recommend it.
don't be fooled it has a "start button".. but it still does not have the Start menu that everyone wants..
i.e. the new start button does some things.. like link to control panel.. but does NOT have the menu of all programs so you can start them from there.. you still have to go back to metro for that..
IMHO 8.1 like 8 still falls between 2 stools and is not as good as 7 for a pure desktop OS..... if you have mouse/key/screen (with no touch).. Win 7 is best.... if you have tablet/touch.. jury still out...(I defy anyone to say they can work well with an excel sheet in touch mode).
Cheers