Well guys, It still isn't fixed.
1998 Buick Park Ave w/ ~120k and 15k on cheap Goodyear tires.
The tire shop told me it was an alignment problem. The alignment shop said it was a tire problem. The mechanic said it was an engine mount and rotor problem.
I replaced front and rear mounts (had to pay a mechanic for the rear trans mount) , replaced all rotors and brake pads, had tires inspected, balanced and rotated, and paid for an alignment. None of it amounted to a hill of beans. I have twice paid for an inspection of the vehicle to discover all possible sources of vibration and specifically asked both shops to check the hubs. I checked them myself but I'm not an expert and wanted a second opinion. Everyone said the hubs were fine and that they were definitely not responsible for my vibration problem, so today I jacked it up and let the tires run in another attempt to figure it out.
Check this out: buick3 - YouTube
The front right tire is fine. The front left tire catches, drags, squeels, and generally misbehaves. The video doesn't show quite show how badly the wheel catches and lugs the engine down but you can hear it pretty clearly. It'* awful. How can two professionals charging shop rates miss this!? Was I paying them for the best guess? Obviously something is wrong here and they missed it even though I stood there and pointed at the area I thought was causing a problem. Damn waste of money.
So.... if this is not a hub issue then what else could it be? The problem was not made better or worse when replacing rotors so I doubt I interfered with anything there.
I'm looking for a sure diagnosis before throwing any more money at this problem. Whaddya think?