vitamin recs please.

I can't wait to meet with my dietician but want to plan now.  What multivitamin do you use?  I'm currently using centrum for women over 50 right now.  I think that will be OK if I add more b12, calcium and iron to it.  I'm already d and iron deficient so don't want more problems.  I'm scheduled for RNY on 4/14.  thanks, sandra