how pure are the vit. we take?!

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Well, there are many higher quality companies out there that make various vitamins and supplements, are readily available and well priced... but there are also some low quality companies that are just asking to be shut down (often called "fly by night" companies) just to get a quick foothold into a fad product like Acai or Noni among others. That's one big reason that you want to check on the quality of the company you want to buy from.
The most important thing in checking on the quality is to make sure the company has a good rating with either the GMP (Good Manufacturing Practices) or USP (U.S. Pharmacopoeia), as those are the main quality assurance organizations (USP is for the U.S., GMP is for the U.S. and worldwide). As long as they have good quality, the vitamins and other nutrients will be virtually identical and have good levels of purity in the pill.

A few of the top quality companies I've found (all of which are competitors, so shop around for the best price) are at http://www.swansonvitamins.com http://www.puritanspride.com and http://www.vitacost.com
Regardless of which company you look at, I would call the company selling it and ask them to verify their quality. Don't just ask if their quality is good... ask them to prove it. Ask what quality testing organization they use and what kind of rating they've gotten (if applicable, as some don't rate, they just pass/fail).
If they don't know or can't tell you *why* they have good quality (or at least check with a supervisor if the representative is new), they probably don't have good quality. It's not so much if they can tell you that they have quality, it's more important for them to say *why* they have good quality so you can verify it. To paraphrase Tommy Boy, anyone can crap in a bag and tell you it's the best quality ;-)

It's the right of the consumer to know what they're getting and to make their choices from an educated standing. I hope I helped!

I'm a Product Specialist for a vitamin company and I get asked questions like this quite often ;-)