Here is an update on my hunt for the buzz. I checked the balljoints and one was completely shot, so I replaced both, as well as both sway bar links. Still had the buzz, but the car drove better, and I don't think the buzz was as bad!I had my kid drive it to a burger joint and it stopped on him. The battery was dead and the system not charging. So I traded out the alternaor and now it is charging. I drove it to work today and it does still buzz but it was at least somewhat more tolerable.
I checked and secured the lines in front of the firewall.
It is speed related but not engine speed related. The drive shaft is something I hadn't thought about. I changed the center bearing a couple of years ago.
I can at least stand to drive it as I continue to evaluate the situation.