Sorry, my second post. Really worried for you man! Columbia is only good for MBA. You will make the biggest mistake in your life if you choose Columbia MSOR over LSE Fin&Econ. I even know a girl that chose LSE fin&econ over MIT Mfin. She was from Yale though.
all the way LSE Fin & Econ and don't look back. This applies even if you want go back to China.