Update: this car has been at the local dealer now for a month. They called me periodically, they were going to change the transmission, then they were going fix the transmission, then they were sending the transmisison 400km's away to be fixed.......etc..etc.
Today, I get a call telling me they installed someone elses snow tires on rims and the noise is gone. So they tell me its my problem now, the car is fine.
To recap: my 3 different brands of tires on 2 different styles/sizes of wheels made the EXACT same noise, but now that they have found tires that mask the issue, all is well.
The warranty ends in 3 weeks. I have the impression they just want to get me out the door.
Has anyone ever had tires that made an oscillating noise at at one single speed level and were fine at all other speeds?