Just for reference, I have seen cars come into my old shop with vibration problems. One came in with a lot of wheel vibration. We pulled the wheels and balanced them, but the car still had this vibration. After a little discussion with the owner, we found out that he had the front brakes replaced. We pulled the rotors (floating style, not bolted down like your car) and there was a little bit of rust that had fallen between the rotor and hub. Cleaned this up and the car was smooth as silk. Not all solutions are this easy, but try the easy stuff first.
Pull the wheels, have them balanced, clean all the corrosion off the surface between the wheel and spacer, look at the surface of the hub centric if applicable and clean it up with a scotchbrite pad. If this doesn't work, look into someone who has an old school highspeed balancer, you may have a tire that is going bad, but balances fine.
Hope this helps
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