FWIW, I did a lot of research on this issue last year, and I decided that the product that offered the most appropriate amounts of the most desirable nutrients was Centrum Ultra [Men's/Women's] tablets.
Centrum has a pretty good website
that gives enough detail on what's in their
tablets that you can actually make good comparisons with other brands.
Since I've never found any information seriously questioning the purity of Centrum products, and since the price is reasonable, we're comfortable using them.
Disclaimer: I'm also one of those wackos who take additional supplemental Vitamin C, so my advice is worth exactly what you paid for it.