Junior need for suggestion (From China)

Hello, I am a Chinese former Big 4 employee. I was expecting an average life. However, Recently, i was dumped by my girl friend. So i reconsidered my life. I plan to go back to school for MBA at my early 30s, i believe i may target one of the ivy league. Here are my questions:

   1. I had a banchler degree from Canadian University and a master degree from UK university. However both schools are not famous. Therefore, will it be a barrier for me to get into an investment banking or private equity after MBA?

   2. Currently, i have two job choices, I can either go back to big 4 or i can go to a Chinese state-owned private equity. Which one should be better if i would like to go to US private equity or investment banking after MBA?

   Many thanks, and sorry about my poor english.