Disclaimer: I am going to be blunt and to the point.
The best overall breed is........ the one that best fits your needs. It is a personal choice that only you can make based on your requirements. Asking people for their opinion will only leave you more confused because in what I have read so far there is many different breeds posted here that say they are the best. All which is true for the people who have them but you need to access what you want and need. I have 5 of the breeds mentioned here and in those I have quiet ones and some that are rather vocal and not breed specific. Every animal on the face of the earth react differently to stimuli and chickens are no exception. They are as individual as you and I so to say this breed or that is best is far sighted. Unless you have a specific goal ie....lots of eggs,green ones ect.
There are many factors in which chickens to get, you should make a list of what you want and what you need and go through the breed index and find one that fits most closely. Not often do we get exactly what we want and need but it can happen. The only way you might achieve quiet chickens is to get a bunch and cull the noisy ones but that is no guarantee the others won't speak up. Just falling short of keeping them totally enclosed or getting a bucket from the Colonel.
Completely agree! I have a mixed flock. None of them fit their breed descriptions perfectly. I just had to get a boatload of chickens and slowly remove the ones that didn't suit our needs. This spring I am hatching mutts, and two dozen eggs of assorted breeds. If I'm lucky, tomorrow I will pick up a pair of Barnevelders. Just try all kinds. Chickens are just like people; unique.