+1

A 1:1 recreation of the Windows XP or Windows 7 user experience with the classic theme would be killer.

I say this with love, I have used KDE extensively and I still find it more janky than Windows XP. Gnome is "better" (especially since v40) in that it's consistent and has a few nicer utilities, but it also has worse UX (at least for power users) than Windows XP.