Career Options - Advice Needed

I’m now working as a compliance officer in a big commercial bank for more than 2.5 years. I’m now holding FRM cert and just sat for CFA L2. I obtained a BSE and wanted to have a Master degree/MBA in the near future. I have the intention to work as an analyst in investment banks rather than commercial banks. And I just recvd a chance to work in MSCI[Morgan Stanley Capital Int’l] as a sales associate. Should I accept the offer? I want to know the career path of a sales analyst in the indices companies (or investment banks). And anybody have the idea of that company? thanks for your replies in advance.