value of non-MBA Masters program in Marketing/Communications - offered by prestigious university?

[g0getter]

My employer has identified me as a hi-potential employee and would like to sponsor me for a postgraduate course (any non-MBA Masters program). While my part time studies will be paid for, the catch is I will have to be bonded accordingly (1 year bond for 1 year of studies). In that regard, I have a few questions to ask before committing to this offer:

1. I work in the Marketing/Communications field. In general, do employers value a Masters' certification? That is, do they offer better pay packages/career prospects than their degree counterparts? I asked also because there's the possibility of overqualification, and thus it'd be harder to find employment next time.

2. Are there Masters programs offered by prestigious universities (ivy league or the likes) relevant to my field? I am currently working in Singapore and could not find any ivy league partner offering Masters programs here.

3. Otherwise, are there distance learning options provided by these top universities? (I have checked at least 4 of them, and none offer such an option for Masters programs)

4. On another note, what is the value of single certificate programs in relation to the employer/company? One example here: http://www.ecornell.com/certificates/

Thank you for your time.