i went for Ancelotti because of his history with milan. i preorderd Mourinho's book because he has had success at every club he has been at. van Gaal's as well because of the clubs he has been at and players that have worked under him.
one of Venables books look interesting but i worried that it was reminising about his time with the england squad.
from what i could see most of fergusons were about his life and his victorys but not on tactics nor his man-management.