The problem with making equipment recommendations is that there are so many elements to a PA system, and so many venues in which one might be used that it is impossible to make blanket recommendations. I used to own three separate PAs for different types of venues.
The only reason that I use a headband arrangement at all is that I already have the mic. Most often I use it in musical theatre situations where it is usually glued somewhere on my face. This is perfect for me since I don't ever have to worry about it during costume changes; it is completely out of the way, like I'm not even wearing one.
A headset mike certainly can be the way to go, like a Countryman E6, but you need to know whether you need an omnidirectional or directional pick up pattern (The answer may not be as obvious as it seems!). You also need to know what other equipment will be used. For multiple performers, it is idea to have identical mic setups for each one. If not identical, at the very least similar functioning.
Another reason to go with a "headband" arrangement is if you want to avoid a "close-miked" sound. I prefer a more ambient quality to the sound, using more of a "sound reinforcement" technique than PA. This can really help with plosives, siblances and other diction challenges.
Really you have to start by defining in detail what you want it to sound like before any sound engineer will be able to tell you what gear you need to accomplish your audio goals.
Just as terms like "arm rods" and "mouthplates" and "playboards" won't have much meaning to a non-puppeteer, terms like "condenser", "dynamic", "hyper-cardioid" and "phantom power" won't mean much to non-microphone-geeks. It pays to hire a professional.