To follow up with Wyane's question a a bit further, what will this person be doing while in front of the camera? Is it only one person? Basically spell it out for us. With audio, there is no one perfect solution or mic to cover all possibilities. I do sound for TV for a living and people always ask me how I would mic a person while we are taping them. To me, that's a hugely open ended question. I then ask this person, usually a producer of some sort, all the same questions I just asked you. Because if a person is set down in a chair and not moving around so much and its only a single shot, then a lav (hidden or exposed) is used for one channel and then a boom mic over the top and just out of frame for the other channel. That gives me all sorts of options and safety. And the editors love having options.
Now let's go to a polar opposite situation. What if this person is doing an exersize program, rolling around on the floor all while talking through the steps and actually sweating and doing the workout? Oh, and its a three camera shoot, so no boom mic over the top? What then? You don't want to see wires in the shot, or shadows from boom mics or the actual mic, so a wireless solution is the answer with a lav mic, but a transmitter that can deal with the moisture and be small enough to be hidden and not hurt the person rolling around. And yes, they do exist.
Yeah, that's an extreme example for sure, but one that I had to deal with once. Audio isn't just a one mic kind of solution, much like in selecting a lens for your camera, there is no one mic to cover every situation. And to get the broadcast quality you said you wanted, there are no cheap answers, so be ready to pony up some cash to get that sound.
Let us know and we can get you the right answers.