Fourth vote for Mint.
You can use lightweight GUIs for it, or if you’ve got a relatively new computer (one that can run Windows 7, for example), you can just run all default.
It’s the closest to the old single taskbar WIMP (Windows, Icons, Menus, Pointer) interface from Win 95 to Win 7.
Of course, now it’s more like the fifth or sixth vote while I was editing the post. :-/