I have the dreaded vibration problems with my 2000 2.7T, so far I have done the following:
Changed the tiers (Conti procontacts)
Lower front control arms.
Balanced tiers.
Alignment checked multipurpose times.
checked bearings no play
little to no play in the tie rod ends
check tire pressures on a regular basis.

but yet I still have sporadic vibrations. At this point I am at a loss to see what else could be the cause of my vibrations.

 

Collectively I think my Vibrations were caused by a bunch of different things.

Explain where your is coming from and when.
ie. steering wheel, or seat, brake pedal at idle or in gear, turn the a/c off and it gets better or only at MPH and up.

It's easier to pinpoint an area that way.