Are you doing business related PhD? or something different? BTW, I also have the interest to commence PhD once complete the taught course of MBA. DBA will be out of my choice as I have done enough in MBA.

Anyway, I really like the work from @Juniortok, that saying the study in the top 50 MBA business school in will be the best choice as I really fell the waste of 1.5 years at the current point. Again, money is another crucial point as the limited of fund capital.

So, let's move on...