If it were my child then either Sanchez-Casal (as I know Emilio) or Equelite.
A-SC because Emilio and co have a proven track record in producing players who have made college level and above and you have access to some incredible coaches like Pato, Dani Sorribas and Emilio and Sergio.
Equelite because Antonio is one of the few coaches I know of who have worked with a player from literally day one to the tour and it's a bit smaller than some so the attention is more personal.
I tweet - @ashtennis guru (no spaces)
I Shoot - www.flickr.com/photos/ashtennis guru/ (again no spaces! grrr)