NOW makes several good multis that come in non-compacted caps so they break up pretty nicely in your system. As Shizen said, Jarrow is good for the same reasons, as well as using the methylcobalamin form of B12, which is a bit better than the Cyanocobalamin that most every other brand uses( which has the potential to break up into teensy, harmless amounts of cyanide). Absolute top-of-the-line is the expensive Life Extension multi, but they come in tiny little increments and you have to take like 17 a day, and therefore be a little more insane than I.
Mostly, pay no attention to "foo-foo" ingredients like chlorophyll, green tea and ginseng which are usually in the multi in too small amounts to do anything. If you want those, take a separate supp or just take the natural form.
Even Flintstones chewables are better than Centrum complete IMO, because they get somewhat uncompacted by chewing.(wouldn't recommend chewing centrum)