I have the Banjo burners on propane. They are almost completely silent, and they have air adjustments. Two of them shipped to my house was about $100. That's the good part.
They are very sensitive to wind, and I brew outside. I will need to add wind screens.
Also, they have a lot of flame and heat that rolls out from under the kettles. I will need to play with the distance from the kettles, and hopefully the wind screens will help focus the heat to the center.
I don't have jet burners, but they look like they direct the heat a lot more focused than the Banjo's.
They have set air mixtures, so that's either great, or not so great... don't know.
As far as overkill... I don't believe there is such a thing as overkill. More is always better. My bottom line was, which are quieter.