what is the best multi vitamin?!

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As you can see from the other answers, there is no single answer. Truth be told, any answer given here will just be personal opinion (I can give you my opinion if you'd like). There are many higher quality companies out there that are readily available and well priced... just 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 the company has good quality, anything they have would just be different varieties of ingredients... women's/men's combos, multis with added herbs, basic multis, etc, etc. After quality, the formulation will entirely vary depending on what specifics/benefits you're looking for. Some want a basic multiple, some want added herbs to help other parts of the body, some want gender-specific, etc... that's why there are SO many multiples on the market. ;-)
Good luck and I hope I helped!

Health/nutrition classes, personal experience, and personal research in my role as a Product Specialist for a vitamin company

Any natural source multivitamin is superior to synthetic. Quality vitamins are generally sold at health food stores. Avoid the cheap drug store types.
MD's get no training in nutrition or supplements, so your best source of advice would be a natural health practitioner or orthomolecular medicine specialist.
Everyone should take a multivitamin. There is no easy or adequate way to determine what and how much someone is getting from food -- you'd be spending your whole day trying to figure it out. It's complete nonsense. RDA figures have not been researched, they're just guesstimates of what might prevent deficiency. For someone who's already deficient they won't correct the problem. Factory farming methods have seriously depleted the soils of nutrients, so even if you do eat a lot of vegetables, between the soil depletion and the nutrients lost in transit, we're not getting what our ancestors did.

No such thing. The need to supplement a healthy diet is a marketing myth devised to make money and you've been sucked in.

Unless your doctor proscribed a supplement after extensive testing all you are doing is producing very expensive pee.

The one your doctor prescribes.