Your problem sounds somewhat similar to the problem I experienced.

Warped rotors can be a source of wheel vibration. A lot of things can cause wheel vibration, as well.

You may have bad tires. Your tires may be improperly balanced. You may have a worn out suspension component, like I ultimately had (worn out tie tod end).

I would recommend getting your tires balanced first by a Hunter GPS9700 balance machine. The website is located on the thread posted below.

Check it out. I think somewhere on page 2 is listed the many possible sources of wheel vibration:

http://www.peachparts.com/shopforum/showthread.php?threadid=33553&perpage=15&pagenumber=1

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".