According to [link|http://michael.toren.net/mirrors/tie/|this] I use the half Windsor. The full (or double) Windsor is only for spread-collar shirts, which I don't have any of. The four-in-hand is the lazy, crappy one.
And [link|http://www.boardroomties.com/tiedimple.html|this] is the dimple. Do a Windsor -- full or half -- without it and the top of the tie looks like a candy-cane.