As you stated there are so many directions on the road of the unknown cause of a vibration can take us, all which lead to $$$, without correcting the problem. My thoughts was to try the lower control arm bushings since there was a service bulletin issued, and then I did not were to turn to next. After reading your comments, maybe I should flip a coin, but that's why Iím asking for feedback like yours, someone who has walked the walk.
Iím going to let my dealer do the work, and I'll suggest the bushings or motor mounts first. Again thanks for your input, timreid