I truely believe that the starting C needed for this team is Mozgov.
As I understand, and to a certain extend share, your expectations, 2012 is the year we can attack the Magic, Heat, Lakers et al. By the pace Mozgov became better, he should at least be a servicable starting C in this league by then.
If not, I agree with you that we should go after the likes of Gasol or Horford next summer (is Horford still unextanded?)