Hi,
I totally understand your feelings. I'm stuck between a rock and a hard place at the moment. I've read the info on vaccinations, the ingrediants and effects (thanks agin for the links Trish). But what it comes down to me for me is that I work in a children's hospital- my exposure, and therefore his exposure, to contagious childhood illnesses, is pretty huge compared to what a lot of people have.
Best of luck making your desicion. I think it's fantastic that you are making an informed choice rather then just doing what the 'experts' think is best.