Postdoc Salaries?

[John W. Adams, Ph.D.]

I am currently interviewing for different postdoc positions at UCSF, 
Stanford and UC San Diego.  What should I expect in the way of total 
salary working in molecular biology based laboratories with NIH training 
grant funding.  I assume NIH postdoc stipends are in the neighborhood of 
$20,000... and I also assume it is up to the individual PI's to 
supplement the stipend with his/her other grant funding.  Is this 
correct?